22 April 1724|
(now Kaliningrad, Russia)
|Died||12 February 1804 (aged 79)
|Main interests||Epistemology · Metaphysics
Ethics · Logic
|Notable ideas||Categorical imperative
Synthetic a priori
Noumenon · Sapere aude
|Part of a series on|
|Kantianism and Kantian ethics|
Immanuel Kant (German: [ɪˈmaːnu̯eːl kant]; 22 April 1724 – 12 February 1804) was a German philosopher. He is the central figure of modern philosophy, and set the terms by which all subsequent thinkers have had to grapple. He argued that human perception structures natural laws, and that reason is the source of morality. His thought continues to hold a major influence in contemporary thought, especially in fields such as metaphysics, epistemology, ethics, political philosophy, and aesthetics.
Kant's major work, the Critique of Pure Reason (Kritik der reinen Vernunft, 1781), aimed to bring reason together with experience and to move beyond what he took to be failures of traditional philosophy and metaphysics. He hoped to end an age of speculation where objects outside experience were seen to support what he saw as futile theories, while opposing the skepticism of thinkers such as Hume.
It always remains a scandal of philosophy and universal human reason that the existence of things outside us ... should have to be assumed merely on faith, and that if it occurs to anyone to doubt it, we should be unable to answer him with a satisfactory proof.
Kant proposed a "Copernican Revolution-in-reverse", saying that:
Up to now it has been assumed that all our cognition must conform to the objects; but ... let us once try whether we do not get farther with the problems of metaphysics by assuming that the objects must conform to our cognition.
In simple terms, Kant pointed out that we all shape our experience of things through the filter of our mind. The mind shapes that experience, and among other things, Kant believed the concepts of space and time were programmed into the human brain, as was the notion of cause and effect. We never have direct experience of things, the noumenal world, and what we do experience is the phenomenal world as conveyed by our senses. These observations summarize Kant's views upon the subject–object problem.
Kant published other important works on ethics, religion, law, aesthetics, astronomy, and history. These included the Critique of Practical Reason (Kritik der praktischen Vernunft, 1788), the Metaphysics of Morals (Die Metaphysik der Sitten, 1797), which dealt with ethics, and the Critique of Judgment (Kritik der Urteilskraft, 1790), which looks at aesthetics and teleology. He aimed to resolve disputes between empirical and rationalist approaches. The former asserted that all knowledge comes through experience; the latter maintained that reason and innate ideas were prior. Kant argued that experience is purely subjective without first being processed by pure reason. He also said that using reason without applying it to experience only leads to theoretical illusions. The free and proper exercise of reason by the individual was a theme both of the Enlightenment, and of Kant's approaches to the various problems of philosophy.
His ideas influenced many thinkers in Germany during his lifetime. He settled and moved philosophy beyond the debate between the rationalists and empiricists. The philosophers Fichte, Schelling, Hegel and Schopenhauer amended and developed the Kantian system, thus bringing about various forms of German idealism. He is seen as a major figure in the history and development of philosophy. German and European thinking progressed after his time, and his influence still inspires philosophical work today.
Immanuel Kant was born in 1724 in Königsberg, the capital of Prussia at that time, today the city of Kaliningrad in the Russian exclave of Kaliningrad Oblast. He was the fourth of nine children (four of them reached adulthood). Baptized 'Emanuel', he changed his name to 'Immanuel' after learning Hebrew. In his entire life, he never traveled more than ten miles from Königsberg. His father, Johann Georg Kant (1682–1746), was a German harnessmaker from Memel, at the time Prussia's most northeastern city (now Klaipėda, Lithuania). His mother, Anna Regina Reuter (1697–1737), was born in Nuremberg. Kant's paternal grandfather had emigrated from Scotland to East Prussia, and his father still spelled their family name "Cant". In his youth, Kant was a solid, albeit unspectacular, student. He was brought up in a Pietist household that stressed intense religious devotion, personal humility, and a literal interpretation of the Bible. Kant received a stern education – strict, punitive, and disciplinary – that preferred Latin and religious instruction over mathematics and science. Despite being raised in a religious household and still maintaining a belief in God, he was skeptical of religion in later life and was an agnostic. The common myths concerning Kant's personal mannerisms are enumerated, explained, and refuted in Goldthwait's introduction to his translation of Observations on the Feeling of the Beautiful and Sublime. It is often held that Kant lived a very strict and predictable life, leading to the oft-repeated story that neighbors would set their clocks by his daily walks. He never married, but did not seem to lack a rewarding social life - he was a popular teacher and a modestly successful author even before starting on his major philosophical works.
The young scholar 
Kant showed a great aptitude to study at an early age. He was first sent to Collegium Fredericianum and then enrolled at the University of Königsberg (where he would spend his entire career) in 1740, at the age of 16. He studied the philosophy of Leibniz and Wolff under Martin Knutzen, a rationalist who was also familiar with developments in British philosophy and science and who introduced Kant to the new mathematical physics of Newton. Knutzen dissuaded Kant from the theory of pre-established harmony, which he regarded as "the pillow for the lazy mind". He also dissuaded the young scholar from idealism, which was negatively regarded by most philosophers in the 18th century. (The theory of transcendental idealism that Kant developed in the Critique of Pure Reason is not traditional idealism, i.e. the idea that reality is purely mental. In fact, Kant produced arguments against traditional idealism in the second part of the Critique of Pure Reason.) His father's stroke and subsequent death in 1746 interrupted his studies. Kant became a private tutor in the smaller towns surrounding Königsberg, but continued his scholarly research. 1747 saw the publication of his first philosophical work, Thoughts on the True Estimation of Living Forces.
Early work 
Kant is best known for his work in the philosophy of ethics and metaphysics, but he made significant contributions to other disciplines. He made an important astronomical discovery, namely a discovery about the nature of the Earth's rotation, for which he won the Berlin Academy Prize in 1754.
According to Lord Kelvin:
"Kant pointed out in the middle of last century, what had not previously been discovered by mathematicians or physical astronomers, that the frictional resistance against tidal currents on the earth's surface must cause a diminution of the earth's rotational speed. This immense discovery in Natural Philosophy seems to have attracted little attention,--indeed to have passed quite unnoticed,--among mathematicians, and astronomers, and naturalists, until about 1840, when the doctrine of energy began to be taken to heart."—Lord Kelvin, physicist, 1897
According to Thomas Huxley:
"The sort of geological speculation to which I am now referring (geological aetiology, in short) was created as a science by that famous philosopher, Immanuel Kant, when, in 1775 , he wrote his General Natural History and Theory of the Celestial Bodies; or, an Attempt to Account for the Constitutional and Mechanical Origin of the Universe, upon Newtonian Principles."—Thomas H. Huxley, 1869
In the General History of Nature and Theory of the Heavens (Allgemeine Naturgeschichte und Theorie des Himmels) (1755), Kant laid out the Nebular hypothesis, in which he deduced that the Solar System formed from a large cloud of gas, a nebula. He thus attempted to explain the order of the solar system, seen previously by Newton as being imposed from the beginning by God. Kant also correctly deduced that the Milky Way was a large disk of stars, which he theorized also formed from a (much larger) spinning cloud of gas. He further suggested the possibility that other nebulae might also be similarly large and distant disks of stars. These postulations opened new horizons for astronomy: for the first time extending astronomy beyond the solar system to galactic and extragalactic realms.
From this point on, Kant turned increasingly to philosophical issues, although he continued to write on the sciences throughout his life. In the early 1760s, Kant produced a series of important works in philosophy. The False Subtlety of the Four Syllogistic Figures, a work in logic, was published in 1762. Two more works appeared the following year: Attempt to Introduce the Concept of Negative Magnitudes into Philosophy and The Only Possible Argument in Support of a Demonstration of the Existence of God. In 1764, Kant wrote Observations on the Feeling of the Beautiful and Sublime and then was second to Moses Mendelssohn in a Berlin Academy prize competition with his Inquiry Concerning the Distinctness of the Principles of Natural Theology and Morality (often referred to as "The Prize Essay"). In 1770, at the age of 45, Kant was finally appointed Professor of Logic and Metaphysics at the University of Königsberg. Kant wrote his inaugural dissertation in defence of this appointment. This work saw the emergence of several central themes of his mature work, including the distinction between the faculties of intellectual thought and sensible receptivity. Not to observe this distinction would mean to commit the error of subreption, and, as he says in the last chapter of the dissertation, only in avoidance of this error does metaphysics flourish.
The issue that vexed Kant was central to what twentieth century scholars termed "the philosophy of mind." The flowering of the natural sciences had led to an understanding of how data reaches the brain. Sunlight may fall upon a distant object, whereupon light is reflected from various parts of the object in a way that maps the surface features (color, texture, etc.) of the object. The light reaches the eye of a human observer, passes through the cornea, is focused by the lens upon the retina where it forms an image similar to that formed by light passing through a pinhole into a camera obscura. The retinal cells next send impulses through the optic nerve and thereafter they form a mapping in the brain of the visual features of the distant object. The interior mapping is not the exterior thing being mapped, and our belief that there is a meaningful relationship between the exterior object and the mapping in the brain depends on a chain of reasoning that is not fully grounded. But the uncertainty aroused by these considerations, the uncertainties raised by optical illusions, misperceptions, delusions, etc., are not the end of the problems.
Kant saw that the mind could not function as an empty container that simply receives data from the outside. Something must be giving order to the incoming data. Images of external objects must be kept in the same sequence in which they were received. This ordering occurs through the mind's intuition of time. The same considerations apply to the mind's function of constituting space for ordering mappings of visual and tactile signals arriving via the already described chains of physical causation.
It is often held that Kant was a late developer, that he only became an important philosopher in his mid-50s after rejecting his earlier views. While it is true that Kant wrote his greatest works relatively late in life, there is a tendency to underestimate the value of his earlier works. Recent Kant scholarship has devoted more attention to these "pre-critical" writings and has recognized a degree of continuity with his mature work.
The silent decade 
At the age of 46, Kant was an established scholar and an increasingly influential philosopher. Much was expected of him. In correspondence with his ex-student and friend Markus Herz, Kant admitted that, in the Inaugural Dissertation, he had failed to account for the relation and connection between our sensible and intellectual faculties—he needed to explain how we combine sensory knowledge with reasoned knowledge, these being related but very different processes. He also credited David Hume with awakening him from "dogmatic slumber" (circa 1771). Hume had stated that experience consists only of sequences of feelings, images or sounds. Ideas such as 'cause', goodness, or objects were not evident in experience, so why do we believe in the reality of these? Kant felt that reason could remove this skepticism, and he set himself to solving these problems. He did not publish any work in philosophy for the next eleven years.
Although fond of company and conversation with others, Kant isolated himself. He resisted friends' attempts to bring him out of his isolation. In 1778, in response to one of these offers by a former pupil, Kant wrote:
"Any change makes me apprehensive, even if it offers the greatest promise of improving my condition, and I am persuaded by this natural instinct of mine that I must take heed if I wish that the threads which the Fates spin so thin and weak in my case to be spun to any length. My great thanks, to my well-wishers and friends, who think so kindly of me as to undertake my welfare, but at the same time a most humble request to protect me in my current condition from any disturbance."
When Kant emerged from his silence in 1781, the result was the Critique of Pure Reason. Although now uniformly recognized as one of the greatest works in the history of philosophy, this Critique was largely ignored upon its initial publication. The book was long, over 800 pages in the original German edition, and written in a convoluted style. It received few reviews, and these granted no significance to the work. Its density made it, as Johann Gottfried Herder put it in a letter to Johann Georg Hamann, a "tough nut to crack," obscured by "all this heavy gossamer". Its reception stood in stark contrast to the praise Kant received for earlier works, such as his Prize Essay and shorter works that preceded the first Critique. These well-received and readable tracts include one on the earthquake in Lisbon that was so popular that it was sold by the page. Prior to the change in course documented in the first Critique, his books sold well, and by the time he published Observations on the Feeling of the Beautiful and Sublime in 1764 he had become a popular author of some note. Kant was disappointed with the first Critique's reception. Recognizing the need to clarify the original treatise, Kant wrote the Prolegomena to any Future Metaphysics in 1783 as a summary of its main views. He also encouraged his friend, Johann Schultz, to publish a brief commentary on the Critique of Pure Reason.
Kant's reputation gradually rose through the 1780s, sparked by a series of important works: the 1784 essay, "Answer to the Question: What is Enlightenment?"; 1785's Groundwork of the Metaphysics of Morals (his first work on moral philosophy); and, from 1786, Metaphysical Foundations of Natural Science. But Kant's fame ultimately arrived from an unexpected source. In 1786, Karl Reinhold began to publish a series of public letters on the Kantian philosophy. In these letters, Reinhold framed Kant's philosophy as a response to the central intellectual controversy of the era: the Pantheism Dispute. Friedrich Jacobi had accused the recently deceased G. E. Lessing (a distinguished dramatist and philosophical essayist) of Spinozism. Such a charge, tantamount to atheism, was vigorously denied by Lessing's friend Moses Mendelssohn, and a bitter public dispute arose among partisans. The controversy gradually escalated into a general debate over the values of the Enlightenment and the value of reason itself. Reinhold maintained in his letters that Kant's Critique of Pure Reason could settle this dispute by defending the authority and bounds of reason. Reinhold's letters were widely read and made Kant the most famous philosopher of his era.
Mature work 
Kant published a second edition of the Critique of Pure Reason (Kritik der reinen Vernunft) in 1787, heavily revising the first parts of the book. Most of his subsequent work focused on other areas of philosophy. He continued to develop his moral philosophy, notably in 1788's Critique of Practical Reason (known as the second Critique) and 1797's Metaphysics of Morals. The 1790 Critique of Judgment (the third Critique) applied the Kantian system to aesthetics and teleology.
In 1792, Kant's attempt to publish the Second of the four Pieces of Religion within the Bounds of Bare Reason, in the journal Berlinische Monatsschrift, met with opposition from the King's censorship commission, which had been established that same year in the context of 1789 French Revolution. Kant then arranged to have all four pieces published as a book, routing it through the philosophy department at the University of Jena to avoid the need for theological censorship. Kant got a now famous reprimand from the King, for this action of insubordination. When he nevertheless published a second edition in 1794, the censor was so irate that he arranged for a royal order that required Kant never to publish or even speak publicly about religion. Kant then published his response to the King's reprimand and explained himself, in the preface of The Conflict of the Faculties.
He also wrote a number of semi-popular essays on history, religion, politics and other topics. These works were well received by Kant's contemporaries and confirmed his preeminent status in eighteenth century philosophy. There were several journals devoted solely to defending and criticizing the Kantian philosophy. But despite his success, philosophical trends were moving in another direction. Many of Kant's most important disciples (including Reinhold, Beck and Fichte) transformed the Kantian position into increasingly radical forms of idealism. The progressive stages of revision of Kant's teachings marked the emergence of German Idealism. Kant opposed these developments and publicly denounced Fichte in an open letter in 1799. It was one of his final acts expounding a stance on philosophical questions. In 1800, a student of Kant, Gottlob Benjamin Jäsche, published a manual of logic for teachers called Logik, which he had prepared at Kant's request. Jäsche prepared the Logik using a copy of a textbook in logic by Georg Freidrich Meier entitled Auszug aus der Vernunftlehre, in which Kant had written copious notes and annotations. The Logik has been considered of fundamental importance to Kant's philosophy, and the understanding of it. The great nineteenth century logician Charles Sanders Peirce remarked, in an incomplete review of Thomas Kingsmill Abbott's English translation of the introduction to the Logik, that "Kant's whole philosophy turns upon his logic." Also, Robert Schirokauer Hartman and Wolfgang Schwarz, wrote in the translators' introduction to their English translation of the Logik, "Its importance lies not only in its significance for the Critique of Pure Reason, the second part of which is a restatement of fundamental tenets of the Logic, but in its position within the whole of Kant's work."
Kant's health, long poor, took a turn for the worse and he died at Königsberg on 12 February 1804, uttering "Es ist gut" ("It is good") before expiring. His unfinished final work, the fragmentary Opus Postumum, was, as its title suggests, published posthumously.
In Kant's essay "Answering the Question: What is Enlightenment?", Kant defined the Enlightenment as an age shaped by the Latin motto Sapere aude ("Dare to Know"). Kant maintained that one ought to think autonomously, free of the dictates of external authority. His work reconciled many of the differences between the rationalist and empiricist traditions of the 18th century. He had a decisive impact on the Romantic and German Idealist philosophies of the 19th century. His work has also been a starting point for many 20th century philosophers.
Kant asserted that, because of the limitations of argumentation in the absence of irrefutable evidence, no one could really know whether there is a God and an afterlife or not. For the sake of morality and as a ground for reason, Kant asserted, people are justified in believing in God, even though they could never know God's presence empirically. He explained:
All the preparations of reason, therefore, in what may be called pure philosophy, are in reality directed to those three problems only [God, the soul, and freedom]. However, these three elements in themselves still hold independent, proportional, objective weight individually. Moreover, in a collective relational context; namely, to know what ought to be done: if the will is free, if there is a God, and if there is a future world. As this concerns our actions with reference to the highest aims of life, we see that the ultimate intention of nature in her wise provision was really, in the constitution of our reason, directed to moral interests only.
The sense of an enlightened approach and the critical method required that "If one cannot prove that a thing is, he may try to prove that it is not. And if he succeeds in doing neither (as often occurs), he may still ask whether it is in his interest to accept one or the other of the alternatives hypothetically, from the theoretical or the practical point of view. Hence the question no longer is as to whether perpetual peace is a real thing or not a real thing, or as to whether we may not be deceiving ourselves when we adopt the former alternative, but we must act on the supposition of its being real." The presupposition of God, soul, and freedom was then a practical concern, for "Morality, by itself, constitutes a system, but happiness does not, unless it is distributed in exact proportion to morality. This, however, is possible in an intelligible world only under a wise author and ruler. Reason compels us to admit such a ruler, together with life in such a world, which we must consider as future life, or else all moral laws are to be considered as idle dreams... ."
- the epistemology of Transcendental Idealism and
- the moral philosophy of the autonomy of practical reason.
These teachings placed the active, rational human subject at the center of the cognitive and moral worlds. Kant argued that the rational order of the world as known by science was not just the fortuitous accumulation of sense perceptions.
Conceptual unification and integration is carried out by the mind through concepts or the "categories of the understanding" operating on the perceptual manifold within space and time. The latter are not concepts, but are forms of sensibility that are a priori necessary conditions for any possible experience. Thus the objective order of nature and the causal necessity that operates within it are dependent upon the mind's processes, the product of the rule-based activity that Kant called, "synthesis. There is much discussion among Kant scholars on the correct interpretation of this train of thought.
The 'two-world' interpretation regards Kant's position as a statement of epistemological limitation, that we are not able to transcend the bounds of our own mind, meaning that we cannot access the "thing-in-itself". Kant, however, also speaks of the thing in itself or transcendental object as a product of the (human) understanding as it attempts to conceive of objects in abstraction from the conditions of sensibility. Following this line of thought, some interpreters have argued that the thing in itself does not represent a separate ontological domain but simply a way of considering objects by means of the understanding alone – this is known as the two-aspect view.
The notion of the "thing in itself" was much discussed by those who came after Kant. It was argued that since the "thing in itself" was unknowable its existence could not simply be assumed. Rather than arbitrarily switching to an account that was ungrounded in anything supposed to be the "real," as did the German Idealists, another group arose to ask how our (presumably reliable) accounts of a coherent and rule-abiding universe were actually grounded. This new kind of philosophy became known as Phenomenology, and its founder was Edmund Husserl.
With regard to morality, Kant argued that the source of the good lies not in anything outside the human subject, either in nature or given by God, but rather is only the good will itself. A good will is one that acts from duty in accordance with the universal moral law that the autonomous human being freely gives itself. This law obliges one to treat humanity – understood as rational agency, and represented through oneself as well as others – as an end in itself rather than (merely) as means to other ends the individual might hold. This necessitates practical self-reflection in which we universalize our reasons.
These ideas have largely framed or influenced all subsequent philosophical discussion and analysis. The specifics of Kant's account generated immediate and lasting controversy. Nevertheless, his theses – that the mind itself necessarily makes a constitutive contribution to its knowledge, that this contribution is transcendental rather than psychological, that philosophy involves self-critical activity, that morality is rooted in human freedom, and that to act autonomously is to act according to rational moral principles – have all had a lasting effect on subsequent philosophy.
Theory of perception 
Kant defines his theory of perception in his influential 1781 work The Critique of Pure Reason, which has often been cited as the most significant volume of metaphysics and epistemology in modern philosophy. Kant maintains that our understanding of the external world had its foundations not merely in experience, but in both experience and a priori concepts, thus offering a non-empiricist critique of rationalist philosophy, which is what he and others referred to as his "Copernican revolution".
Firstly, Kant's distinction between analytic and synthetic propositions:
- Analytic proposition: a proposition whose predicate concept is contained in its subject concept; e.g., "All bachelors are unmarried," or, "All bodies take up space."
- Synthetic proposition: a proposition whose predicate concept is not contained in its subject concept ; e.g., "All bachelors are happy," or, "All bodies have weight."
Analytic propositions are true by nature of the meaning of the words involved in the sentence—we require no further knowledge than a grasp of the language to understand this proposition. On the other hand, synthetic statements are those that tell us something about the world. The truth or falsehood of synthetic statements derives from something outside of their linguistic content. In this instance, weight is not a necessary predicate of the body; until we are told the heaviness of the body we do not know that it has weight. In this case, experience of the body is required before its heaviness becomes clear. Before Kant's first Critique, empiricists (cf. Hume) and rationalists (cf. Leibniz) assumed that all synthetic statements required experience to be known.
Kant, however, contests this: he claims that elementary mathematics, like arithmetic, is synthetic a priori, in that its statements provide new knowledge, but knowledge that is not derived from experience. This becomes part of his over-all argument for transcendental idealism. That is, he argues that the possibility of experience depends on certain necessary conditions—which he calls a priori forms—and that these conditions structure and hold true of the world of experience. In so doing, his main claims in the "Transcendental Aesthetic" are that mathematic judgments are synthetic a priori and in addition, that Space and Time are not derived from experience but rather are its preconditions.
Once we have grasped the concepts of addition, subtraction or the functions of basic arithmetic, we do not need any empirical experience to know that 100 + 100 = 200, and in this way it would appear that arithmetic is in fact analytic. However, that it is analytic can be disproved thus: if the numbers five and seven in the calculation 5 + 7 = 12 are examined, there is nothing to be found in them by which the number 12 can be inferred. Such it is that "5 + 7" and "the cube root of 1,728" or "12" are not analytic because their reference is the same but their sense is not—that the mathematic judgment "5 + 7 = 12" tells us something new about the world. It is self-evident, and undeniably a priori, but at the same time it is synthetic. And so Kant proves a proposition can be synthetic and known a priori.
Kant asserts that experience is based both upon the perception of external objects and a priori knowledge. The external world, he writes, provides those things that we sense. It is our mind, though, that processes this information about the world and gives it order, allowing us to comprehend it. Our mind supplies the conditions of space and time to experience objects. According to the "transcendental unity of apperception", the concepts of the mind (Understanding) and the perceptions or intuitions that garner information from phenomena (Sensibility) are synthesized by comprehension. Without the concepts, intuitions are nondescript; without the intuitions, concepts are meaningless—thus the famous statement, "Thoughts without content are empty, intuitions without concepts are blind."
Kant also makes the claim that an external environment is necessary for the establishment of the self. Although Kant would want to argue that there is no empirical way of observing the self, we can see the logical necessity of the self when we observe that we can have different perceptions of the external environment over time. By uniting all of these general representations into one global representation, we can see how a transcendental self emerges. “I am therefore conscious of the identical self in regard to the manifold of the representations that are given to me in an intuition because I call them all together my representations."
Categories of the Faculty of Understanding 
In studying the work of Kant one must realize that there is a distinction between "understanding" as the general concept (in German, das Verstehen) and the "understanding" as a faculty of the human mind (in German, der Verstand, "the intellect"). In much English language scholarship, the word "understanding" is used in both senses.
Kant deemed it obvious that we have some objective knowledge of the world, such as, say, Newtonian physics. But this knowledge relies on synthetic, a priori laws of nature, like causality and substance. The problem, then, is how this is possible. Kant's solution was to reason that the subject must supply laws that make experience of objects possible, and that these laws are the synthetic, a priori laws of nature that we know apply to all objects before we experience them. So, to deduce all these laws, Kant examined experience in general, dissecting in it what is supplied by the mind from what is supplied by the given intuitions. What has just been explicated is commonly called a transcendental reduction.
To begin with, Kant's distinction between the a posteriori being contingent and particular knowledge, and the a priori being universal and necessary knowledge, must be kept in mind. For if we merely connect two intuitions together in a perceiving subject, the knowledge is always subjective because it is derived a posteriori, when what is desired is for the knowledge to be objective, that is, for the two intuitions to refer to the object and hold good of it necessarily universally for anyone at anytime, not just the perceiving subject in its current condition. What else is equivalent to objective knowledge besides the a priori, that is to say, universal and necessary knowledge? Nothing else, and hence before knowledge can be objective, it must be incorporated under an a priori category of the understanding.
For example, say a subject says, "The sun shines on the stone; the stone grows warm," which is all he perceives in perception. His judgment is contingent and holds no necessity. But if he says, "The sunshine causes the stone to warm," he subsumes the perception under the category of causality, which is not found in the perception, and necessarily synthesizes the concept sunshine with the concept heat, producing a necessarily universally true judgment.
To explain the categories in more detail, they are the preconditions of the construction of objects in the mind. Indeed, to even think of the sun and stone presupposes the category of subsistence, that is, substance. For the categories synthesize the random data of the sensory manifold into intelligible objects. This means that the categories are also the most abstract things one can say of any object whatsoever, and hence one can have an a priori cognition of the totality of all objects of experience if one can list all of them. To do so, Kant formulates another transcendental deduction.
Judgments are, for Kant, the preconditions of any thought. Man thinks via judgments, so all possible judgments must be listed and the perceptions connected within them put aside, so as to make it possible to examine the moments when the understanding is engaged in constructing judgments. For the categories are equivalent to these moments, in that they are concepts of intuitions in general, so far as they are determined by these moments universally and necessarily. Thus by listing all the moments, one can deduce from them all of the categories.
One may now ask: How many possible judgments are there? Kant believed that all the possible propositions within Aristotle's syllogistic logic are equivalent to all possible judgments, and that all the logical operators within the propositions are equivalent to the moments of the understanding within judgments. Thus he listed Aristotle's system in four groups of three: quantity (universal, particular, singular), quality (affirmative, negative, infinite), relation (categorical, hypothetical, disjunctive) and modality (problematic, assertoric, apodeictic). The parallelism with Kant's categories is obvious: quantity (unity, plurality, totality), quality (reality, negation, limitation), relation (substance, cause, community) and modality (possibility, existence, necessity).
The fundamental building blocks of experience, i.e. objective knowledge, are now in place. First there is the sensibility, which supplies the mind with intuitions, and then there is the understanding, which produces judgments of these intuitions and can subsume them under categories. These categories lift the intuitions up out of the subject's current state of consciousness and place them within consciousness in general, producing universally necessary knowledge. For the categories are innate in any rational being, so any intuition thought within a category in one mind is necessarily subsumed and understood identically in any mind. In other words we filter what we see and hear.
Kant ran into a problem with his theory that the mind plays a part in producing objective knowledge. Intuitions and categories are entirely disparate, so how can they interact? Kant's solution is the schema: a priori principles by which the transcendental imagination connects concepts with intuitions through time. All the principles are temporally bound, for if a concept is purely a priori, as the categories are, then they must apply for all times. Hence there are principles such as substance is that which endures through time, and the cause must always be prior to the effect.
Moral philosophy 
In the Groundwork, Kant's method involves trying to convert our everyday, obvious, rational knowledge of morality into philosophical knowledge. The latter two works followed a method of using "practical reason", which is based only upon things about which reason can tell us, and not deriving any principles from experience, to reach conclusions which are able to be applied to the world of experience (in the second part of The Metaphysic of Morals).
Kant is known for his theory that there is a single moral obligation, which he called the "Categorical Imperative", and is derived from the concept of duty. Kant defines the demands of the moral law as "categorical imperatives". Categorical imperatives are principles that are intrinsically valid; they are good in and of themselves; they must be obeyed in all, and by all, situations and circumstances if our behavior is to observe the moral law. It is from the Categorical Imperative that all other moral obligations are generated, and by which all moral obligations can be tested. Kant also stated that the moral means and ends can be applied to the categorical imperative, that rational beings can pursue certain "ends" using the appropriate "means". Ends that are based on physical needs or wants always gives merely hypothetical imperatives. The categorical imperative, however, may be based only on something that is an "end in itself". That is, an end that is a means only to itself and not to some other need, desire, or purpose. He believed that the moral law is a principle of reason itself, and is not based on contingent facts about the world, such as what would make us happy, but to act upon the moral law which has no other motive than "worthiness of being happy". Accordingly, he believed that moral obligation applies only to rational agents.
A categorical imperative is an unconditional obligation; that is, it has the force of an obligation regardless of our will or desires (Contrast this with hypothetical imperative) In Groundwork of the Metaphysic of Morals (1785) Kant enumerated three formulations of the categorical imperative that he believed to be roughly equivalent.
Kant believed that if an action is not done with the motive of duty, then it is without moral value. He thought that every action should have pure intention behind it; otherwise it was meaningless. He did not necessarily believe that the final result was the most important aspect of an action, but that how the person felt while carrying out the action was the time at which value was set to the result.
In Groundwork of the Metaphysic of Morals, Kant also posited the "counter-utilitarian idea that there is a difference between preferences and values and that considerations of individual rights temper calculations of aggregate utility", a concept that is an axiom in economics:
Everything has either a price or a dignity. Whatever has a price can be replaced by something else as its equivalent; on the other hand, whatever is above all price, and therefore admits of no equivalent, has a dignity. But that which constitutes the condition under which alone something can be an end in itself does not have mere relative worth, i.e., price, but an intrinsic worth, i.e., a dignity. (p. 53, italics in original).
A phrase quoted by Kant, which is used to summarize the counter-utilitarian nature of his moral philosophy, is Fiat justitia, pereat mundus, ("Let justice be done, though the world perish"), which he translates loosely as "Let justice reign even if all the rascals in the world should perish from it". This appears in his 1795 Perpetual Peace (Zum ewigen Frieden. Ein philosophischer Entwurf.), Appendix 1.
The first formulation 
The first formulation (Formula of Universal Law) of the moral imperative "requires that the maxims be chosen as though they should hold as universal laws of nature" . This formulation in principle has as its supreme law the creed "Always act according to that maxim whose universality as a law you can at the same time will" and is the "only condition under which a will can never come into conflict with itself [....]"
One interpretation of the first formulation is called the "universalizability test". An agent's maxim, according to Kant, is his "subjective principle of human actions": that is, what the agent believes is his reason to act. The universalisability test has five steps:
- Find the agent's maxim (i.e., an action paired with its motivation). Take for example the declaration "I will lie for personal benefit". Lying is the action; the motivation is to fulfill some sort of desire. Paired together, they form the maxim.
- Imagine a possible world in which everyone in a similar position to the real-world agent followed that maxim. With no exception of one's self. This is in order for you to hold people to the same principle required of yourself.
- Decide whether any contradictions or irrationalities arise in the possible world as a result of following the maxim.
- If a contradiction or irrationality arises, acting on that maxim is not allowed in the real world.
- If there is no contradiction, then acting on that maxim is permissible, and is sometimes required.
The second formulation 
The second formulation (or Formula of the End in Itself) holds that "the rational being, as by its nature an end and thus as an end in itself, must serve in every maxim as the condition restricting all merely relative and arbitrary ends". The principle dictates that you "[a]ct with reference to every rational being (whether yourself or another) so that it is an end in itself in your maxim", meaning that the rational being is "the basis of all maxims of action" and "must be treated never as a mere means but as the supreme limiting condition in the use of all means, i.e., as an end at the same time".
The third formulation 
The third formulation (Formula of Autonomy) is a synthesis of the first two and is the basis for the "complete determination of all maxims". It says "that all maxims which stem from autonomous legislation ought to harmonize with a possible realm of ends as with a realm of nature". In principle, "So act as if your maxims should serve at the same time as the universal law (of all rational beings)", meaning that we should so act that we may think of ourselves as "a member in the universal realm of ends", legislating universal laws through our maxims (that is, a code of conduct), in a "possible realm of ends". None may elevate themselves above the universal law, therefore it is one's duty to follow the maxim(s).
Idea of God 
Kant stated the practical necessity for a belief in God in his Critique of Practical Reason. As an idea of pure reason, "we do not have the slightest ground to assume in an absolute manner ... the object of this idea", but adds that the idea of God cannot be separated from the relation of happiness with morality as the "ideal of the supreme good". The foundation of this connection is an intelligible moral world, and "is necessary from the practical point of view"; compare Voltaire: "If God did not exist, it would be necessary to invent him." In the Jäsche Logic (1800) he wrote "One cannot provide objective reality for any theoretical idea, or prove it, except for the idea of freedom, because this is the condition of the moral law, whose reality is an axiom. The reality of the idea of God can only be proved by means of this idea, and hence only with a practical purpose, i.e., to act as though (als ob) there is a God, and hence only for this purpose" (9:93, trans. J. Michael Young, Lectures on Logic, p. 590–91).
Along with this 'idea' on reason and God, Kant places thought over religion and nature, i.e. the idea of religion being natural or naturalistic. Kant saw reason as natural, and as some part of Christianity is based on reason and morality, as Kant points out this is major in the scriptures, it is inevitable that Christianity is 'natural'. However, it is not 'naturalistic' in the sense that the religion does include supernatural or transcendent belief. Aside from this, a key point is that Kant saw that the Bible should be seen as a source of natural morality no matter whether there is/was any truth behind the supernatural factor, meaning that it is not necessary to know whether the supernatural part of Christianity has any truth to abide by and use the core Christian moral code.
Kant articulates in Book Four some of his strongest criticisms of the organization and practices of religious organizations that encourage what he sees as a religion of counterfeit service to God. Among the major targets of his criticism are external ritual, superstition and a hierarchical church order. He sees all of these as efforts to make oneself pleasing to God in ways other than conscientious adherence to the principle of moral rightness in the choice of one's actions. The severity of Kant's criticisms on these matters, along with his rejection of the possibility of theoretical proofs for the existence of God and his philosophical re-interpretation of some basic Christian doctrines, have provided the basis for interpretations that see Kant as thoroughly hostile to religion in general and Christianity in particular (e.g., Walsh 1967).Nevertheless, other interpreters consider that Kant was trying to mark off a defensible rational core of Christian belief. Kant sees in Jesus Christ the affirmation of a "pure moral disposition of the heart" that "can make man well-pleasing to God".
Kant had exposure to Islam as well and reflected about the role of reason therein.
Idea of freedom 
In the Critique of Pure Reason, Kant distinguishes between the transcendental idea of freedom, which as a psychological concept is "mainly empirical" and refers to "the question whether we must admit a power of spontaneously beginning a series of successive things or states" as a real ground of necessity in regard to causality, and the practical concept of freedom as the independence of our will from the "coercion" or "necessitation through sensuous impulses". Kant finds it a source of difficulty that the practical concept of freedom is founded on the transcendental idea of freedom, but for the sake of practical interests uses the practical meaning, taking "no account of... its transcendental meaning," which he feels was properly "disposed of" in the Third Antinomy, and as an element in the question of the freedom of the will is for philosophy "a real stumbling-block" that has "embarrassed speculative reason".
Kant calls practical "everything that is possible through freedom", and the pure practical laws that are never given through sensuous conditions but are held analogously with the universal law of causality are moral laws. Reason can give us only the "pragmatic laws of free action through the senses", but pure practical laws given by reason a priori dictate "what ought to be done".
The categories of freedom 
In the Critique of Practical Reason, at the end of the second Main Part of the Analytics, Kant introduces, in analogy with the categories of understanding their practical counterparts, the categories of freedom. Kant’s categories of freedom appear to have primarily three functions: as conditions of the possibility for actions (i) to be free, (ii) to be comprehensible as free and (iii) to be morally evaluated. For Kant actions, although qua theoretical objects they are always already constituted by means of the theoretical categories, qua practical objects (objects of reason in its practical use, i.e. objects qua possibly good or bad) they are constituted by means of the categories of freedom; and it is only in this way that actions, qua phenomena, can be a consequence of freedom, and can be understood and evaluated as such.
Aesthetic philosophy 
Kant discusses the subjective nature of aesthetic qualities and experiences in Observations on the Feeling of the Beautiful and Sublime, (1764). Kant's contribution to aesthetic theory is developed in the Critique of Judgment (1790) where he investigates the possibility and logical status of "judgments of taste." In the "Critique of Aesthetic Judgment," the first major division of the Critique of Judgment, Kant used the term "aesthetic" in a manner that, according to Kant scholar W.H. Walsh, differs from its modern sense. Prior to this, in the Critique of Pure Reason, to note essential differences between judgments of taste, moral judgments, and scientific judgments, Kant abandoned the term "aesthetic" as "designating the critique of taste," noting that judgments of taste could never be "directed" by "laws a priori". After A. G. Baumgarten, who wrote Aesthetica (1750–58), Kant was one of the first philosophers to develop and integrate aesthetic theory into a unified and comprehensive philosophical system, utilizing ideas that played an integral role throughout his philosophy.
In the chapter "Analytic of the Beautiful" of the Critique of Judgment, Kant states that beauty is not a property of an artwork or natural phenomenon, but is instead a consciousness of the pleasure that attends the 'free play' of the imagination and the understanding. Even though it appears that we are using reason to decide what beautiful, the judgment is not a cognitive judgment, "and is consequently not logical, but aesthetical" (§ 1). A pure judgement of taste is in fact subjective insofar as it refers to the emotional response of the subject and is based upon nothing but esteem for an object itself: it is a disinterested pleasure, and we feel that pure judgements of taste, i.e. judgements of beauty, lay claim to universal validity (§§20–22). It is important to note that this universal validity is not derived from a determinate concept of beauty but from common sense [source?]. Kant also believed that a judgement of taste shares characteristics engaged in a moral judgement: both are disinterested, and we hold them to be universal. In the chapter "Analytic of the Sublime" Kant identifies the sublime as an aesthetic quality that, like beauty, is subjective, but unlike beauty refers to an indeterminate relationship between the faculties of the imagination and of reason, and shares the character of moral judgments in the use of reason. The feeling of the sublime, itself officially divided into two distinct modes (the mathematical and the dynamical sublime), describes two subjective moments, both of which concern the relationship of the faculty of the imagination to reason. Some commentators, however, argue that Kant's critical philosophy contains a third kind of the sublime, the moral sublime, which is the aesthetic response to the moral law or a representation thereof, and a development of the "noble" sublime in Kant's theory of 1764. The mathematical sublime is situated in the failure of the imagination to comprehend natural objects that appear boundless and formless, or appear "absolutely great" (§ 23–25). This imaginative failure is then recuperated through the pleasure taken in reason's assertion of the concept of infinity. In this move the faculty of reason proves itself superior to our fallible sensible self (§§ 25–26). In the dynamical sublime there is the sense of annihilation of the sensible self as the imagination tries to comprehend a vast might. This power of nature threatens us but through the resistance of reason to such sensible annihilation, the subject feels a pleasure and a sense of the human moral vocation. This appreciation of moral feeling through exposure to the sublime helps to develop moral character.
Kant had developed the distinction between an object of art as a material value subject to the conventions of society and the transcendental condition of the judgment of taste as a "refined" value in the propositions of his Idea of A Universal History (1784). In the Fourth and Fifth Theses of that work he identified all art as the "fruits of unsociableness" due to men's "antagonism in society", and in the Seventh Thesis asserted that while such material property is indicative of a civilized state, only the ideal of morality and the universalization of refined value through the improvement of the mind of man "belongs to culture".
Political philosophy 
In Perpetual Peace: A Philosophical Sketch Kant listed several conditions that he thought necessary for ending wars and creating a lasting peace. They included a world of constitutional republics. His classical republican theory was extended in the Science of Right', the first part of the Metaphysics of Morals (1797).
"Kant's political teaching may be summarized in a phrase: republican government and international organization. In more characteristically Kantian terms, it is doctrine of the state based upon the law (Rechtsstaat) and of eternal peace. Indeed, in each of these formulations, both terms express the same idea: that of legal constitution or of "peace through law." ... Taken simply by itself, Kant's political philosophy, being essentially a legal doctrine, rejects by definition the opposition between moral education and the play of passions as alternate foundations for social life. The state is defined as the union of men under law. The state rightly so called is constituted by laws which are necessary a priori because they flow from the very concept of law. A regime can be judged by no other criteria nor be assigned any other functions, than those proper to the lawful order as such." 
He opposed "democracy," which at his time meant direct democracy, believing that majority rule posed a threat to individual liberty. He stated, "...democracy is, properly speaking, necessarily a despotism, because it establishes an executive power in which 'all' decide for or even against one who does not agree; that is, 'all,' who are not quite all, decide, and this is a contradiction of the general will with itself and with freedom." As with most writers at the time, he distinguished three forms of government i.e. democracy, aristocracy, and monarchy with mixed government as the most ideal form of it.
Kant lectured on anthropology for over 25 years. His Anthropology from a Pragmatic Point of View was published in 1798. (This was the subject of Michel Foucault's doctoral dissertation.) Kant's Lectures on Anthropology were published for the first time in 1997 in German. The former was translated into English and published by the Cambridge Texts in the History of Philosophy series in 2006.
Kant's influence on Western thought has been profound. Over and above his influence on specific thinkers, Kant changed the framework within which philosophical inquiry has been carried out. He accomplished a paradigm shift: very little philosophy is now carried out as an extension, or in the style of pre-Kantian philosophy. This shift consists in several closely related innovations that have become axiomatic, in philosophy itself and in the social sciences and humanities generally:
- Kant's "Copernican revolution", that placed the role of the human subject or knower at the center of inquiry into our knowledge, such that it is impossible to philosophize about things as they are independently of us or of how they are for us;
- His invention of critical philosophy, that is of the notion of being able to discover and systematically explore possible inherent limits to our ability to know through philosophical reasoning
- His creation of the concept of "conditions of possibility", as in his notion of "the conditions of possible experience" – that is that things, knowledge, and forms of consciousness rest on prior conditions that make them possible, so that, to understand or to know them, we must first understand these conditions
- His theory that objective experience is actively constituted or constructed by the functioning of the human mind
- His notion of moral autonomy as central to humanity
- His assertion of the principle that human beings should be treated as ends rather than as means
Some or all of these Kantian ideas can be seen in schools of thought as different from one another as German Idealism, Marxism, positivism, phenomenology, existentialism, critical theory, linguistic philosophy, structuralism, post-structuralism, and deconstructionism.[dubious ]
Historical influence 
During his own life, there was much critical attention paid to his thought. He did have a positive influence on Reinhold, Fichte, Schelling, Hegel, and Novalis during the 1780s and 1790s. The school of thinking known as German Idealism developed from his writings. The German Idealists Fichte and Schelling, for example, tried to bring traditional "metaphysically" laden notions like "the Absolute," "God," or "Being" into the scope of Kant's critical thought. In so doing, the German Idealists tried to reverse Kant's view that we cannot know what we cannot observe.
Hegel was one of his first major critics. In response to what he saw as Kant's abstract and formal account, Hegel brought about an ethic focused on the "ethical life" of the community. But Hegel's notion of "ethical life" is meant to subsume, rather than replace, Kantian ethics. And Hegel can be seen as trying to defend Kant's idea of freedom as going beyond finite "desires," by means of reason. Thus, in contrast to later critics like Nietzsche or Russell, Hegel shares some of Kant's most basic concerns.
Kant's thinking on religion was used in Britain to challenge the decline in religious faith in the nineteenth century. British Catholic writers, notably G. K. Chesterton and Hilaire Belloc, followed this approach. Ronald Englefield debated this movement, and Kant's use of language. See Ronald Englefield's article, reprinted in Englefield Criticisms of Kant were common in the realist views of the new positivism at that time.
Arthur Schopenhauer was strongly influenced by Kant's transcendental idealism. He, like G. E. Schulze, Jacobi and Fichte before him, was critical of Kant's theory of the thing in itself. Things in themselves, they argued, are neither the cause of what we observe nor are they completely beyond our access. Ever since the first Critique of Pure Reason philosophers have been critical of Kant's theory of the thing in itself. Many have argued, if such a thing exists beyond experience then one cannot posit that it affects us causally, since that would entail stretching the category 'causality' beyond the realm of experience. For a review of this problem and the relevant literature see The Thing in Itself and the Problem of Affection in the revised edition of Henry Allison's Kant's Transcendental Idealism. For Schopenhauer things in themselves do not exist outside the non-rational will. The world, as Schopenhauer would have it, is the striving and largely unconscious will.
With the success and wide influence of Hegel's writings, Kant's influence began to wane, though there was in Germany a movement that hailed a return to Kant in the 1860s, beginning with the publication of Kant und die Epigonen in 1865 by Otto Liebmann. His motto was "Back to Kant", and a re-examination of his ideas began (See Neo-Kantianism). During the turn of the 20th century there was an important revival of Kant's theoretical philosophy, known as the Marburg School, represented in the work of Hermann Cohen, Paul Natorp, Ernst Cassirer, and anti-Neo-Kantian Nicolai Hartmann.
Kant's notion of "Critique" or criticism has been quite influential. The Early German Romantics, especially Friedrich Schlegel in his "Athenaeum Fragments", used Kant's self-reflexive conception of criticism in their Romantic theory of poetry. Also in Aesthetics, Clement Greenberg, in his classic essay "Modernist Painting", uses Kantian criticism, what Greenberg refers to as "immanent criticism", to justify the aims of Abstract painting, a movement Greenberg saw as aware of the key limitiaton—flatness—that makes up the medium of painting. French philosopher Michel Foucault was also greatly influenced by Kant's notion of "Critique" and wrote several pieces on Kant for a re-thinking of the Enlightenment as a form of "critical thought". He went so far as to classify his own philosophy as a "critical history of modernity, rooted in Kant".
Kant believed that mathematical truths were forms of synthetic a priori knowledge, which means they are necessary and universal, yet known through intuition. Kant's often brief remarks about mathematics influenced the mathematical school known as intuitionism, a movement in philosophy of mathematics opposed to Hilbert's formalism, and the logicism of Frege and Bertrand Russell.
Influence on modern thinkers 
The Kantian paradigm shift in philosophy and metaphysics has been sustained. Some British and American philosophers trace their intellectual origins to Hume: however, Kant acknowledged Hume as awakening him from his 'dogmatic slumbers', and his work articulated and clarified the issues looked at by Hume. (See The silent decade section, above).
Due to the influence of Strawson and Sellars, among others, there has been a renewed interest in Kant's view of the mind. Central to many debates in philosophy of psychology and cognitive science is Kant's conception of the unity of consciousness.
Jürgen Habermas and John Rawls are two significant political and moral philosophers whose work is strongly influenced by Kant's moral philosophy. They have each argued against relativism, supporting the Kantian view that universality is essential to any viable moral philosophy.
Kant's influence also has extended to the social and behavioral sciences, as in the sociology of Max Weber, the psychology of Jean Piaget, and the linguistics of Noam Chomsky. Because of the thoroughness of the Kantian paradigm shift, his influence extends to thinkers who neither specifically refer to his work nor use his terminology.
Tomb and statue 
Kant's tomb is today in a mausoleum adjoining the northeast corner of Königsberg Cathedral in what is now known as Kaliningrad, Russia. The mausoleum was constructed by the architect Friedrich Lahrs and was finished in 1924 in time for the bicentenary of Kant's birth. Originally, Kant was buried inside the cathedral, but in 1880 his remains were moved outside and placed in a neo-Gothic chapel adjoining the northeast corner of the cathedral. Over the years, the chapel became dilapidated before it was demolished to make way for the mausoleum, which was built on the same spot, where it is today.
The tomb and its mausoleum are some of the few artifacts of German times preserved by the Soviets after they conquered and annexed the city. Today, many newlyweds bring flowers to the mausoleum.
A replica of the statue of Kant that stood in German times in front of the main University of Königsberg building was donated by a German entity in the early 1990s and placed in the same grounds.
After the expulsion of Königsberg's German population at the end of World War II, the historical University of Königsberg where Kant taught was replaced by the Russian-speaking Kaliningrad State University, which took up the campus and surviving buildings of the historic German university. In 2005, that Russian-speaking university was renamed Immanuel Kant State University of Russia in honour of Kant. The change of name was announced at a ceremony attended by President Vladimir Putin of Russia and Chancellor Gerhard Schröder of Germany, and the university further formed a Kant Society, dedicated to the study of Kantianism.
List of works 
- (1746) Thoughts on the True Estimation of Vital Forces (Gedanken von der wahren Schätzung der lebendigen Kräfte)
- (1755) A New Elucidation of the First Principles of Metaphysical Cognition (Neue Erhellung der ersten Grundsätze metaphysischer Erkenntnisse; Doctoral Thesis: Principiorum primorum cognitionis metaphysicae nova dilucidatio)
- (1755) Universal Natural History and Theory of Heaven (Allgemeine Naturgeschichte und Theorie des Himmels)
- (1756) Monadologia Physica
- (1762) The False Subtlety of the Four Syllogistic Figures (Die falsche Spitzfindigkeit der vier syllogistischen Figuren)
- (1763) The Only Possible Argument in Support of a Demonstration of the Existence of God (Der einzig mögliche Beweisgrund zu einer Demonstration des Daseins Gottes)
- (1763) Attempt to Introduce the Concept of Negative Magnitudes into Philosophy (Versuch den Begriff der negativen Größen in die Weltweisheit einzuführen)
- (1764) Observations on the Feeling of the Beautiful and Sublime (Beobachtungen über das Gefühl des Schönen und Erhabenen)
- (1764) Essay on the Illness of the Head (Über die Krankheit des Kopfes)
- (1764) Inquiry Concerning the Distinctness of the Principles of Natural Theology and Morality (the Prize Essay) (Untersuchungen über die Deutlichkeit der Grundsätze der natürlichen Theologie und der Moral)
- (1766) Dreams of a Spirit Seer (On Emmanuel Swedenborg) (Träume eines Geistersehers)
- (1770) Inaugural Dissertation (De mundi sensibilis atque intelligibilis forma et principiis)
- (1775) On the Different Races of Man (Über die verschiedenen Rassen der Menschen)
- (1781) First edition of the Critique of Pure Reason (Kritik der reinen Vernunft)
- (1783) "Prolegomena to any Future Metaphysics" (Prolegomena zu einer jeden künftigen Metaphysik)
- (1784) "An Answer to the Question: What Is Enlightenment?" (Beantwortung der Frage: Was ist Aufklärung?)
- (1784) "Idea for a Universal History with a Cosmopolitan Purpose" (Idee zu einer allgemeinen Geschichte in weltbürgerlicher Absicht)
- (1785) Groundwork of the Metaphysics of Morals (Grundlegung zur Metaphysik der Sitten)
- (1786) Metaphysical Foundations of Natural Science (Metaphysische Anfangsgründe der Naturwissenschaft)
- (1786) Conjectural Beginning of Human History
- (1787) Second edition of the Critique of Pure Reason (Kritik der reinen Vernunft)
- (1788) Critique of Practical Reason (Kritik der praktischen Vernunft)
- (1790) Critique of Judgement (Kritik der Urteilskraft)
- (1790) The Science of Right
- (1793) Religion within the Limits of Reason Alone (Die Religion innerhalb der Grenzen der bloßen Vernunft)
- (1793) On the Old Saw: That may be right in theory, but it won't work in practice (Über den Gemeinspruch: Das mag in der Theorie richtig sein, taugt aber nicht für die Praxis)
- (1795) Perpetual Peace (Zum ewigen Frieden)
- (1796-7) The Metaphysics of Ethics. Translated with an introd. and appendix by J.W. Semple (1836) online text in English
- (1797) Metaphysics of Morals (Metaphysik der Sitten)
- (1798) Anthropology from a Pragmatic Point of View (Anthropologie in pragmatischer Hinsicht)
- (1798) The Contest of Faculties (Der Streit der Fakultäten)
- (1800) Logic (Logik)
- (1803) On Pedagogy (Über Pädagogik)
- (1804) Opus Postumum
- (1817) Lectures on Philosophical Theology (Immanuel Kants Vorlesungen über die philosophische Religionslehre edited by K. H. L. Pölitz). [The English edition of A. W. Wood & G. M. Clark (Cornell, 1978) is based on Pölitz' second edition, 1830, of these lectures.]
See also 
- "Immanuel Kant (Stanford Encyclopedia of Philosophy)". Plato.stanford.edu. 20 May 2010. Retrieved 2011-10-22.
- Kant, Immanuel; Kitcher, Patricia (intro.); Pluhar, W. (trans.) (1996). Critique of Pure Reason. Indianapolis: Hackett. xxviii.
- "Transcendental Arguments (Stanford Encyclopedia of Philosophy)". Plato.stanford.edu. 25 February 2011. Retrieved 2011-10-22.
- Rohlf, Michael, "Immanuel Kant", The Stanford Encyclopedia of Philosophy (Fall 2010 Edition), Edward N. Zalta (ed.)
- Nigel Warburton (2011). "Chapter 19: Rose-tinted reality: Immanuel Kant". A little history of philosophy. Yale University Press. pp. 111 ff. ISBN 0300152086.
- "Immanuel Kant (Stanford Encyclopedia of Philosophy)". Plato.stanford.edu. 20 May 2010. Retrieved 2011-10-22.
- Kuehn, Manfred. Kant: a Biography. Cambridge University Press, 2001, p. 26
- Lewis, Rick. 2005. 'Kant 200 Years On'. Philosophy Now. No. 49.
- "Cosmopolis". Koenigsberg-is-dead.de. 23 April 2001. Retrieved 2009-07-24. Kant's mother's name is sometimes erroneously given as Anna Regina Porter.
- Biographical information sourced from: Kuehn, Manfred. Kant: a Biography. Cambridge University Press, 2001. ISBN 0-521-49704-3 the standard biography of Kant in English.
- "While this sounds skeptical, Kant is only agnostic about our knowledge of metaphysical objects such as God. And, as noted above, Kant's agnosticism leads to the conclusion that we can neither affirm nor deny claims made by traditional metaphysics." Andrew Fiala, J. M. D. Meiklejohn, Critique of Pure Reason - Introduction, page xi.
- Ed Hindson, Ergun Caner, Edward J. Verstraete, ed. (2008). The Popular Encyclopedia of Apologetics: Surveying the Evidence for the Truth of Christianity. Harvest House Publishers. p. 82. ISBN 9780736920841. "It is in this sense that modern atheism rests heavily upon the skepticism of David Hume and the agnosticism of Immanuel Kant."
- "Kant's Agnosticism: Should We Be Agnostic About It?". I Don't Have Enough Faith to Be an Atheist. Crossway. 2004. pp. 59–60. ISBN 9781581345612. "Immanuel Kant's impact has been even more devastating to the Christian worldview than David Hume's. For if Kant's philosophy is right, then there is no way to know anything about the real world, even empirically verifiable things!"
- Gary D. Badcock (1997). Light of Truth and Fire of Love: A Theology of the Holy Spirit. Wm. B. Eerdmans Publishing. p. 113. ISBN 9780802842886. "Kant has no interest in prayer or worship, and is in fact agnostic when it comes to such classical theological questions as the doctrine of God or of the Holy Spirit."
- Norman L. Geisler, Paul K. Hoffman, ed. (2006). "The Agnosticism of Immanuel Kant". Why I Am a Christian: Leading Thinkers Explain Why They Believe. Baker Books. p. 45. ISBN 9780801067129.
- Frank K. Flinn (2007). Encyclopedia of Catholicism. Infobase Publishing. p. 10. ISBN 9780816075652. "Following Locke, the classic agnostic claims not to accept more propositions than are warranted by empirical evidence. In this sense an agnostic appeals to Immanuel Kant (1724–1804), who claims in his Critique of Pure Reason that since God, freedom, immortality, and the soul can be both proved and disproved by theoretical reason, we ought to suspend judgement about them."
- Kant, Immanuel. Observations on the Feeling of the Beautiful and Sublime. Trans. John T. Goldthwait. University of California Press, 1961, 2003. ISBN 0-520-24078-2
- The American International Encyclopedia (New York: J.J. Little & Ives, 1954), Vol. IX.
- George Gamow, One, Two, Three... Infinity, p. 300ff. Viking Press, 1954
- Cf., for example, Susan Shell, The Embodiment of Reason (Chicago, 1996)
- Christopher Kul-Want and Andrzej Klimowski, Introducing Kant (Cambridge: Icon Books, 2005). ISBN 1-84046-664-2
- Ein Jahrhundert deutscher Literaturkritik, vol/. III, Der Aufstieg zur Klassik in der Kritik der Zeit (Berlin, 1959), pp. 315; as quoted in Gulyga, Arsenij. Immanuel Kant: His Life and Thought. Trans., Marijan Despaltović. Boston: Birkhäuser, 1987.
- Gulyga, Arsenij. Immanuel Kant: His Life and Thought. Trans., Marijan Despaltović. Boston: Birkhäuser, 1987 pp. 28–9.
- Gulyga, Arsenij. Immanuel Kant: His Life and Thought. Trans., Marijan Despaltović. Boston: Birkhäuser, 1987, p. 62.
- Derrida Vacant Chair p. 44.
- "Open letter by Kant denouncing Fichte's Philosophy (in German)". Korpora.org. Retrieved 2009-07-24.
- Peirce, C.S., Collected Papers of Charles Sanders Peirce, v.1, (HUP, 1960), 'Kant and his Refutation of Idealism' pp. 15
- Kant, Immanuel, Logic, G.B. Jäsche (ed), R.S. Hartman, W. Schwarz (translators), Indianapolis, 1984, p. xv.
- Karl Vorländer, Immanuel Kant: Der Mann und das Werk, Hamburg: Meiner, 1992, p. II 332.
- Critique of Pure Reason, A801.
- The Science of Right, Conclusion.
- Critique of Pure Reason, A811.
- In the first edition of the Critique of Pure Reason Kant refers to space as "no discursive or...general conception of the relation of things, but a pure intuition" and maintained that "We can only represent to ourselves one space". The "general notion of spaces...depends solely upon limitations" (Meikeljohn trans., A25). In the second edition of the CPR, Kant adds, "The original representation of space is an a priori intuition, not a concept" (Kemp Smith trans., B40). In regard to time, Kant states that "Time is not a discursive, or what is called a general concept, but a pure form of sensible intuition. Different times are but parts of one and the same time; and the representation which can be given only through a single object is intuition" (A31/B47). For the differences in the discursive use of reason according to concepts and its intuitive use through the construction of concepts, see Critique of Pure Reason (A719/B747 ff. and A837/B865). On "One and the same thing in space and time" and the mathematical construction of concepts, see A724/B752.
- See, e.g., "Kant, Immanuel", in The Columbia Encyclopedia, Sixth Edition: Bartleby.com[dead link]; thefreedictionary.com; factmonster.com; infoplease.com
- The German word Anschauung, which Kant used, literally means 'looking at' and generally means what in philosophy in English is called "perception". However it sometimes is rendered as "intuition": not, however, with the vernacular meaning of an indescribable or mystical experience or sixth sense, but rather with the meaning of the direct perception or grasping of sensory phenomena. In this article, both terms, "perception" and "intuition" are used to stand for Kant's Anschauung.
- Immanuel Kant, Critique of Pure Reason , trans. Norman Kemp Smith (N.Y.: St. Martins, 1965), A 51/B 75.
- Kant, Immanuel. Critique of Pure Reason. Ed. Paul Guyer and Allen W. Wood. Cambridge: Cambridge UP, 1998. p.248.
- Immanuel Kant, Prolegomena to perhaps Any Future Metaphysics, pages 35 to 43.
- Deleuze on Kant, from where the definitions of a priori and a posteriori were obtained.
- Immanuel Kant, Prolegomena to Any Future Metaphysics, pages 35 to 43.
- Immanuel Kant, Critique of Judgment, the Introduction to the Hackett edition.
- Kant, Immanuel. Foundations of the Metaphysics of Morals. Trans. Lewis White Beck. Page numbers citing this work are Beck's marginal numbers that refer to the page numbers of the standard edition of Königliche Preussische Akademie der Wissenschaften. Berlin, 1902–38.
- The distinction between rational and philosophical knowledge is given in the Preface to the Groundwork, 1785.
- Kant, Foundations, p. 421.
- Critique of Pure Reason, A806/B834.
- Kant, Foundations, p. 408.
- Kant, Foundations, p. 420–1.
- Kant, Foundations, p. 436.
- Millennium Ecosystem Assessment (2003) Ecosystems and Well-being: A Framework for Assessment. Washington DC: Island Press, p. 142.
- "Perpetual Peace: A Philosophical Sketch: Appendix 1". Constitution.org. Retrieved 2009-07-24.
- Project for a Perpetual Peace, p. 61. Books.google.com. Retrieved 2009-07-24.
- Immanuel Kant's Werke, revidirte Gesammtausg, p. 456. Books.google.com. Retrieved 2009-07-24.
- Kant, Foundations, p. 437.
- "Kant and the German Enlightenment" in "History of Ethics". Encyclopedia of Philosophy, Vol. 3, pp. 95–96. MacMillan, 1973.
- Kant, Foundations, pp. 400, 429.
- Kant, Foundations, pp. 437–8.
- Kant, Foundations, pp. 438–9. See also Kingdom of Ends
- Kant, Critique of Pure Reason, A685/B713.
- Kant, Critique of Pure Reason, A810/B838.
- Originally, "Si Dieu n'existait pas, il faudrait l'inventer.", [[q:Voltaire|]], Épître à l'Auteur du Livre des Trois Imposteurs (10 November 1770).
- "Kant's Philosophy of Religion (Stanford Encyclopedia of Philosophy)". Plato.stanford.edu. Retrieved 2009-07-24.
- Religion within the Limits of Reason Alone (1793), Book IV, Part 1, Section 1, “The Christian religion as a natural religion”
- History of Islam in German thought. Taylor & Francis. Retrieved 2009-07-24.
- The Norman Kemp Smith translation has been used for this section, with citation noting the pagination of the first and second editions.
- Kant, Critique of Pure Reason, A448/B476.
- Kant, Critique of Pure Reason, A534/B562.
- the same distinction of transcendental and practical meaning can be applied to the idea of God, with the proviso that the practical concept of freedom can be experienced (Critique of Pure Reason, A801-804/B829-832).
- Kant, Critique of Pure Reason, A800–2/B828–30.
- The concept of freedom is also handled in the third section of the Foundations of the Metaphysics of Morals. In the Critique of Practical Reason see § VII and § VIII.
- Susanne Bobzien, 'Die Kategorien der Freiheit bei Kant', in Kant: Analysen, Probleme, Kritik Vol.1, 1988, 193-220.
- Critique of Judgment in "Kant, Immanuel" Encyclopedia of Philosophy. Vol 4. Macmillan, 1973.
- Kant, Critique of Pure Reason, A22/B36.
- Beardsley, Monroe. "History of Aesthetics". Encyclopedia of Philosophy. Vol. 1, section on "Toward a unified aesthetics", p. 25, Macmillan 1973. Baumgarten coined the term "aesthetics" and expanded, clarified, and unified Wolffian aesthetic theory, but had left the Aesthetica unfinished (See also: Tonelli, Giorgio. "Alexander Gottlieb Baumgarten". Encyclopedia of Philosophy. Vol. 1, Macmillan 1973). In Bernard's translation of the Critique of Judgment he indicates in the notes that Kant's reference in § 15 in regard to the identification of perfection and beauty is probably a reference to Baumgarten.
- German Idealism in "History of Aesthetics" Encyclopedia of Philosophy. Vol 1. Macmillan, 1973.
- Kant's general discussions of the distinction between "cognition" and "conscious of" are also given in the Critique of Pure Reason (notably A320/B376), and section V and the conclusion of section VIII of his Introduction in Logic.
- Clewis, Robert. 2009. The Kantian Sublime and the Revelation of Freedom. Cambridge: Cambridge University Press. http://www.cambridge.org/us/knowledge/isbn/item2326741/?site_locale=en_US
- Kant, Immanuel. Idea for a Universal History. Trans. Lewis White Beck (20, 22). Page numbers are Beck's marginal numbers that refer to the page numbers of the standard edition of Königliche Preussische Akademie der Wissenschaften. Berlin, 1902–38.
- Kant, Immanuel. Idea for a Universal History. Trans. Lewis White Beck (26).
- Perpetual Peace: A Philosophical Sketch (1795)
- Kant, Immanuel. Perpetual Peace. Trans. Lewis White Beck (377).
- Manfred Riedel Between Tradition and Revolution: The Hegelian Transformation of Political Philosophy, Cambridge 1984
- History of Political Philosophy, edited by Leo Strauss and Joseph Cropsey, The University of Chicago Press, 1987, pp.581-582,603
- Kant, Immanuel. Perpetual Peace. Trans. Lewis White Beck (352).
- Thomas Sturm, Kant und die Wissenschaften vom Menschen (Paderborn: Mentis Verlag, 2009).
- Anthropology from a Pragmatic Point of View, ed. Robert B. Louden, introduction by Manfred Kuehn, Cambridge University Press, 2006
- Prof. Oliver A. Johnson claims that, "With the possible exception of Plato's Republic, (Critique of Pure Reason) is the most important philosophical book ever written." Article on Kant within the collection "Great thinkers of the Western World", Ian P. McGreal, Ed., HarperCollins, 1992.
- See Stephen Palmquist, "The Architectonic Form of Kant's Copernican Logic", Metaphilosophy 17:4 (October 1986), pp.266-288; revised and reprinted as Chapter III of Kant's System of Perspectives: An architectonic interpretation of the Critical philosophy (Lanham: University Press of America, 1993).
- "Kant, Immanuel". Newworldencyclopedia.org. Retrieved 2011-10-22.
- There is much debate in the recent scholarship about the extent to which Fichte and Schelling actually overstep the boundaries of Kant's critical philosophy, thus entering the realm of dogmatic or pre-Critical philosophy. Beiser's German Idealism discusses some of these issues. Beiser, Frederick C. German Idealism: The Struggle against Subjectivism, 1781–1801. Cambridge, MA: Harvard University Press, 2002.
- Hegel, Natural Law: The Scientific Ways of Treating Natural Law, Its Place in Moral Philosophy, and Its Relation to the Positive Sciences. trans. T. M. Knox. Philadelphia, PA: University of Pennsylvania Press, 1975. Hegel's mature view and his concept of "ethical life" is elaborated in his Philosophy of Right. Hegel, Philosophy of Right. trans. T. M. Knox. Oxford University Press, 1967.
- Robert Pippin's Hegel's Idealism (Cambridge: Cambridge University Press, 1989) emphasizes the continuity of Hegel's concerns with Kant's. Robert Wallace, Hegel's Philosophy of Reality, Freedom, and God (Cambridge: Cambridge University Press, 2005) explains how Hegel's Science of Logic defends Kant's idea of freedom as going beyond finite "inclinations", contra skeptics such as David Hume.
- Englefield, Ronald, Kant as Defender of the Faith in Nineteenth-century England", Question, 12, 16–27, (Pemberton, London)
- Englefield, Ronald, Critique of Pure Verbiage, Essays on Abuses of Language in Literary, Religious, and Philosophical Writings, edited by G. A. Wells and D. R. Oppenheimer, Open Court, 1990.
- Beck, Lewis White. "Neo-Kantianism". In Encyclopedia of Philosophy. Vol. 5–6. Macmillan, 1973. Article on Neo-Kantianism by a translator and scholar of Kant.
- Cerf, Walter. "Nicolai Hartmann". In Encyclopedia of Philosophy. Vol. 3-4. Macmillan, 1973. Nicolai was a realist who later rejected the idealism of Neo-Kantianism, his anti-Neo-Kantian views emerging with the publication of the second volume of Hegel (1929).
- Schlegel, Friedrich. "Athenaeum Fragments", in Philosophical Fragments. Trans. Peter Firchow. Minneapolis, MN: University of Minnesota Press, 1991. See especially fragments Nos. 1, 43, 44.
- Greenberg, Clement. "Modernist Painting", in The Philosophy of Art, ed. Alex Neill and Aaron Ridley, McGraw-Hill, 1995.
- See "Essential Works of Foucault: 1954-1984 vol.2: Aesthetics, Method, and Epistemology." ed by James Faubion, Trans. Robert Hurley et al. New York City, New York: The New Press, 1998 (2010 reprint). See essay "Foucault by Maurice Florence" entry by Foucault submitted under pseudonym.
- For a discussion and qualified defense of this position, see Stephen Palmquist, "A Priori Knowledge in Perspective: (I) Mathematics, Method and Pure Intuition", The Review of Metaphysics 41:1 (September 1987), pp.3-22.
- Körner, Stephan, The Philosophy of Mathematics, Dover, 1986. For an analysis of Kant's writings on mathematics see, Friedman, Michael, Kant and the Exact Sciences, Cambridge, MA: Harvard University Press, 1992.
- Ray, James Lee. Does Democracy Cause Peace? Annual Review of Political Science 1998. 1:27-46.
- Empiricists like A. J. Ayer stand out in this regard. See A. J. Ayer's Language Truth and Logic. Dover, 1952.
- De Pierris, Graciela and Friedman, Michael, "Kant and Hume on Causality", The Stanford Encyclopedia of Philosophy (Fall 2008 Edition), Edward N. Zalta (ed.)
- Strawson, P. F., The Bounds of Sense: An Essay on Kant's Critique of Pure Reason. Routledge: 2004. When first published in 1966, this book forced many Anglo-American philosophers to reconsider Kant's Critique of Pure Reason.
- Sellars, Wilfrid, Science and Metaphysics: Variations on Kantian Themes. Ridgeview Publishing Company, 1967
- Korsgaard, Christine. Creating the Kingdom of Ends. Cambridge; New York, NY, US: Cambridge University Press, 1996. ISBN 0-521-49644-6, ISBN 0-521-49962-3 (pbk.) Not a commentary, but a defense of a broadly Kantian approach to ethics
- Brook, Andrew. Kant and the Mind. Cambridge: Cambridge University Press, 1994. See also, Meerbote, R. "Kant's Functionalism". In: J. C. Smith, ed. Historical Foundations of Cognitive Science. Dordrecht, Holland: Reidel, 1991. Brook has an article on Kant's View of the Mind in the Stanford Encyclopedia
- Issacson, Walter. "Einstein: His Life and Universe." p. 20.
- See Habermas, J. Moral Consciousness and Communicative Action. Trans. Christian Lenhardt and Shierry Weber Nicholsen. Cambridge, MA: MIT Press, 1996. For Rawls see, Rawls, John. Theory of Justice Cambridge, MA: Harvard University Press, 1971. Rawls has a well-known essay on Kant's concept of good. See, Rawls, "Themes in Kant's Moral Philosophy" in Kant's Transcendental Deductions. Ed. Eckart Förster. Stanford, CA: Stanford University Press, 1989.
- Habermas, J. (1994): The Unity of Reason in the Diversity of Its Voices. In: Habermas, J. (Eds.): Postmetaphysical Thinking. Political Essays, Cambridge, Massachusetts: 115- 148.
- See Tampio, Nicholas. Kantian Courage: Advancing the Enlightenment in Contemporary Political Theory. New York: Fordham University Press, 2012. ISBN 978-0823245017
- Immanuel Kant. "The Critique of Pure Reason". Etext.library.adelaide.edu.au. Retrieved 2009-07-24.
- Immanuel Kant (20 July 2009). "Projekt Gutenberg-DE - Spiegel Onlinr - Nachrichten - Kultur". Gutenberg.spiegel.de. Retrieved 2009-07-24.
- Frank-Christian Lilienweihs (10 June 1999). "Immanuel Kant: Beantwortung der Frage: Was ist Aufklaerung?". Prometheusonline.de. Retrieved 2009-07-24.
- "Critique of Pure Reason". Hkbu.edu.hk. 31 October 2003. Retrieved 2009-07-24.
- "Projekt Gutenberg-DE - Spiegel Online- Nachrichten - Kultur". Gutenberg.spiegel.de. 20 July 2009. Retrieved 2009-07-24.
- Immanuel Kant (20 July 2009). "Projekt Gutenberg-DE - Spiegel Online - Nachrichten - Kultur". Gutenberg.spiegel.de. Retrieved 2009-07-24.
- wikisource:The Critique of Judgement
- Immanuel Kant. "Religion within the Limits of Reason Alone by Immanuel Kant 1793". Marxists.org. Retrieved 2009-07-24.
- "Immanuel Kant, "Perpetual Peace"". Mtholyoke.edu. Retrieved 2009-07-24.
- "Immanuel Kant: Zum ewigen Frieden, 12.02.2004 (Friedensratschlag)". Uni-kassel.de. Retrieved 2009-07-24.
- "Kant, The Contest of Faculties". Chnm.gmu.edu. Retrieved 2009-07-24.
- Immanuel Kant (20 July 2009). "Projekt Gutenberg-DE - Spiegel Online - Nachrichten - Kultur". Gutenberg.spiegel.de. Retrieved 2009-07-24.
- As noted by Allen Wood in his Introduction, p.12. Wood further speculates that the lectures themselves were delivered in the Winter of 1783-84.
References and further reading 
Any suggestion of further reading on Kant has to take cognizance of the fact that his work has dominated philosophy like no other figure after him. Nevertheless, several guideposts can be made out. In Germany, one important contemporary interpreter of Kant and the movement of German Idealism he began is Dieter Henrich, who has some work available in English. P.F. Strawson's "The Bounds of Sense" (1969) played a significant role in determining the contemporary reception of Kant in England and America. More recent interpreters of note in the English-speaking world include Lewis White Beck, Jonathan Bennett, Henry Allison, Paul Guyer, Christine Korsgaard, Stephen Palmquist, Robert B. Pippin, Roger Scruton, Rudolf Makkreel, and Béatrice Longuenesse.
General introductions to his thought 
- Broad, C. D. Kant: an Introduction. Cambridge University Press, 1978. ISBN 0-521-21755-5, ISBN 0-521-29265-4
- Gardner, Sebastian. Kant and the Critique of Pure Reason. Routledge, 1999. ISBN 0-415-11909-X
- Martin, Gottfried. Kant's Metaphysics and Theory of Science. Greenwood Press, 1955 ISBN 978-0-8371-7154-8 (elucidates Kant's most fundamental concepts in their historical context)
- Perez, Daniel Omar. Kant e o problema da significação. Curitiba: Editora Champagnat, 2008. ISBN 978-85-7292-187-9 (Portuguese)
- Palmquist, Stephen. Kant's System of Perspectives: an architectonic interpretation of the Critical philosophy. Lanham, MD: University Press of America, 1993. ISBN 0-8191-8927-8 (for availability see link)
- Seung, T. K. 2007. Kant: a Guide for the Perplexed. London: Continuum. ISBN 0-8264-8580-4
- Satyananda Giri. Kant. Durham, CT: Strategic Publishing Group, 2010. ISBN 978-1-60911-686-6
- Scruton, Roger. Kant: a Very Short Introduction. Oxford University Press, 2001. ISBN 0-19-280199-6 (provides a brief account of his life, and a lucid introduction to the three major critiques)
- Uleman, Jennifer. An Introduction to Kant's Moral Philosophy. Cambridge University Press, 2010. ISBN 978-0-521-13644-0
Biography and historical context 
- Beck, Lewis White. Early German Philosophy: Kant and his Predecessors. Harvard University Press, 1969. (a survey of Kant's intellectual background)
- Beiser, Frederick C. The Fate of Reason: German Philosophy from Kant to Fichte. Harvard University Press, 1987.
- Beiser, Frederick C. German Idealism: the Struggle against Subjectivism, 1781-1801. Harvard University Press, 2002
- Cassirer, Ernst. Kant's Life and Thought. Translation of Kants Leben und Lehre. Trans., Jame S. Haden, intr. Stephan Körner. New Haven, CT: Yale University Press, 1981.
- Chamberlain, Houston Stewart. Immanuel Kant – a study and a comparison with Goethe, Leonardo da Vinci, Bruno, Plato and Descartes, the authorised translation from the German by Lord Redesdale, with his 'Introduction', The Bodley Head, London, 1914, (2 volumes).
- Gulyga, Arsenij. Immanuel Kant: His Life and Thought. Trans., Marijan Despaltović. Boston: Birkhäuser, 1987.
- Johnson, G.R. (ed.). Kant on Swedenborg. Dreams of a Spirit-Seer and Other Writings. Swedenborg Foundation, 2002. (new translation and analysis, many supplementary texts)
- Kuehn, Manfred. Kant: a Biography. Cambridge University Press, 2001. ISBN 0-521-49704-3. (now the standard biography of Kant in English)
- Lehner, Ulrich L., Kants Vorsehungskonzept auf dem Hintergrund der deutschen Schulphilosophie und -theologie (Leiden: 2007) (Kant's concept of Providence and its background in German school philosophy and theology)
- Pinkard, Terry. German Philosophy, 1760-1860: the Legacy of Idealism. Cambridge, 2002.
- Sassen, Brigitte (ed.). Kant's Early Critics: the Empiricist Critique of the Theoretical Philosophy, Cambridge, 2000.
- Schabert, Joseph A. "Kant's Influence on his Successors", The American Catholic Quarterly Review, Vol. XLVII, January 1922.
Collections of essays 
- Guyer, Paul. ed. The Cambridge Companion to Kant. Cambridge University Press, 1992. ISBN 0-521-36587-2, ISBN 0-521-36768-9. Excellent collection of papers that covers most areas of Kant's thought
- Förster, Eckart ed. "Kant's Transcendental Deductions: The Three 'Critiques' and the 'Opus Postumum.'" Stanford: Stanford University Press, 1989. Includes an important essay by Dieter Henrich'
- Cohen, Ted and Paul Guyer eds. Essays in Kant's Aesthetics. Chicago: University of Chicago Press, 1982. Essays on Kant's Critique of Judgment
- Firestone, Chris L. and Stephen Palmquist (eds.). Kant and the New Philosophy of Religion. Indiana University Press, 2006. ISBN 0-253-21800-4
- Mohanty, J.N. and Robert W. Shahan. eds. Essays on Kant's Critique of Pure Reason. Norman: University of Oklahoma Press, 1982. ISBN 0-8061-1782-6
- Phillips, Dewi et al. Kant and Kierkegaard on Religion. Palgrave Macmillian, 2000, ISBN 0-312-23234-9 Collection of essays about Kantian religion and its influence on Kierkegaardian and contemporary philosophy of religion.
- Proceedings of the International Kant Congresses. Several Congresses (numbered) edited by various publishers.
Theoretical philosophy 
- Allison, Henry. Kant's Transcendental Idealism. New Haven: Yale University Press, 1983, 2004. ISBN 0-300-03629-9, ISBN 0-300-03002-9 (a very influential defense of Kant's idealism, recently revised).
- Ameriks, Karl. Kant's Theory of Mind: An Analysis of the Paralogisms of Pure Reason. Oxford: Clarendon Press, 1982 (one of the first detailed studies of the Dialectic in English).
- Banham, Gary. Kant's Transcendental Imagination London and New York: Palgrave Macmillan, 2006.
- Deleuze, Gilles. Kant's Critical Philosophy. Trans., Hugh Tomlinson and Barbara Habberjam. University of Minnesota Press, 1984. ISBN 0-8166-1341-9, ISBN 0-8166-1436-9
- Dottarelli, Luciano. Kant e la metafisica come scienza, Roma: Erre Emme, 1995. ISBN 88-85378-75-7 (Italian)
- Farias, Vanderlei de Oliveira. Kants Realismus und der Aussenweltskeptizismus. OLMS. Hildesheim, Zürich, New York. 2006. (German)
- Gram, Moltke S. The Transcendental Turn: The Foundation of Kant's Idealism. Gainesville: University Presses of Florida, 1984. ISBN 0-8130-0787-9
- Greenberg, Robert. Kant's Theory of A Priori Knowledge. Penn State Press, 2001 ISBN 0-271-02083-0
- Guyer, Paul. Kant and the Claims of Knowledge. Cambridge: Cambridge University Press, 1987 (modern defense of the view that Kant's theoretical philosophy is a "patchwork" of ill-fitting arguments).
- Guyer, Paul. Knowledge, Reason, and Taste: Kant's Response to Hume. Princeton University Press, 2008.
- Heidegger, Martin. Kant and the Problem of Metaphysics. Trans., Richard Taft. Bloomington: Indiana University Press, 1997. ISBN 0-253-21067-4
- Henrich, Dieter. The Unity of Reason: Essays on Kant's Philosophy. Ed. with introduction by Richard L. Velkley; trans. Jeffrey Edwards et al. Harvard University Press, 1994. ISBN 0-674-92905-5
- Kemp Smith, Norman. A Commentary to Kant's 'Critique of Pure Reason. London: Macmillan, 1930 (influential commentary on the first Critique, recently reprinted).
- Kitcher, Patricia. Kant's Transcendental Psychology. New York: Oxford University Press, 1990.
- Longuenesse, Béatrice. Kant and the Capacity to Judge. Princeton University Press, 1998. ISBN 0-691-04348-5. (argues that the notion of judgment provides the key to understanding the overall argument of the first Critique)
- Melnick, Arthur. Kant's Analogies of Experience. Chicago: University of Chicago Press, 1973. (important study of Kant's Analogies, including his defense of the principle of causality)
- Paton, H. J. Kant's Metaphysic of Experience: a Commentary on the First Half of the Kritik der reinen Vernunft. Two volumes. London: Macmillan, 1936. (extensive study of Kant's theoretical philosophy)
- Pippin, Robert B.. Kant's Theory of Form: an Essay on the Critique of Pure Reason. New Haven: Yale University Press, 1982. (influential examination of the formal character of Kant's work)
- Sala, Giovanni. Kant, Lonergan und der christliche Glaube (Nordhausen: Bautz, 2005), ed. by Ulrich L. Lehner and Ronald K. Tacelli
- Schopenhauer, Arthur. Die Welt als Wille und Vorstellung. Erster Band. Anhang. Kritik der Kantischen Philosophie. F. A. Brockhaus, Leipzig 1859 (In English: Arthur Schopenhauer, New York: Dover Press, Volume I, Appendix, "Criticism of the Kantian Philosophy", ISBN 0-486-21761-2)
- Seung, T. K. Kant's Transcendental Logic. New Haven: Yale University Press, 1969.
- Sgarbi, Marco. La Kritik der reinen Vernunft nel contesto della tradizione logica aristotelica, Hildesheim, Olms 2010
- Strawson, P.F. The Bounds of Sense: an essay on Kant's Critique of Pure Reason. Routledge, 1989 (the work that revitalized the interest of contemporary analytic philosophers in Kant).
- Sturm,Thomas. Kant und die Wissenschaften vom Menschen. Paderborn: Mentis Verlag, 2009. ISBN 3897856085; ISBN 978-3897856080. review (Treats Kant's anthropology and his views on psychology and history in relation to his philosophy of science.)
- Werkmeister, W.H., Kant: The Architectonic and Development of His Philosophy, Open Court Publishing Co., La Salle, Ill.; 1980 ISBN 0-87548-354-3 (it treats, as a whole, the architectonic and development of Kant's philosophy from 1755 through the Opus postumum.)
- Wolff, Robert Paul. Kant's Theory of Mental Activity: a Commentary on the Transcendental Analytic of the Critique of Pure Reason. Cambridge, Mass.: Harvard University Press, 1963. (detailed and influential commentary on the first part of the Critique of Pure Reason)
- Yovel, Yirmiahu. Kant and the Philosophy of History. Princeton: Princeton University Press, 1980. (review)
Practical philosophy 
- Allison, Henry. Kant's theory of freedom. Cambridge University Press 1990.
- Banham, Gary. Kant's Practical Philosophy: From Critique to Doctrine. Palgrave Macmillan, 2003.
- Dorschel, Andreas. Die idealistische Kritik des Willens: Versuch über die Theorie der praktischen Subjektivität bei Kant und Hegel. Hamburg: Felix Meiner, 1992 (Schriften zur Transzendentalphilosophie 10) ISBN 3-7873-1046-0.
- Koorsgaard, Christine M. The Sources of Normativity. Cambridge University Press, 1996.
- Michalson, Gordon E. Fallen Freedom: Kant on Radical Evil and Moral Regeneration. Cambridge University Press, 1990.
- Michalson, Gordon E. Kant and the Problem of God. Blackwell Publishers, 1999.
- Paton, H. J. The Categorical Imperative; a study in Kant's moral philosophy. University of Pennsylvania Press 1971.
- Rawls, John. Lectures on the History of Moral Philosophy. Cambridge, 2000.
- Seung, T.K. Kant's Platonic Revolution in Moral and Political Philosophy. Johns Hopkins, 1994.
- Wolff, Robert Paul. The Autonomy of Reason: A Commentary on Kant's Groundwork of the Metaphysic of Morals. New York: HarperCollins, 1974. ISBN 0-06-131792-6.
- Wood, Allen. Kant's Ethical Thought. New York: Cambridge University Press, 1999.
- Allison, Henry. Kant's Theory of Taste: A Reading of the Critique of Aesthetic Judgment. Cambridge, UK: Cambridge University Press, 2001.
- Banham, Gary. Kant and the Ends of Aesthetics. London and New York: Macmillan Press, 2000.
- Clewis, Robert. The Kantian Sublime and the Revelation of Freedom. Cambridge, UK: Cambridge University Press, 2009.
- Crawford, Donald. Kant's Aesthetic Theory. Wisconsin, 1974.
- Guyer, Paul. Kant and the Claims of Taste. Cambridge, MA and London, 1979.
- Hammermeister, Kai. The German Aesthetic Tradition. Cambridge University Press, 2002.
- Immanuel Kant entry in Kelly, Michael (Editor in Chief) (1998) Encyclopedia of Aesthetics. New York, Oxford, Oxford University Press.
- Makkreel, Rudolf, Imagination and Interpretation in Kant. Chicago, 1990.
- McCloskey, Mary. Kant's Aesthetic. SUNY, 1987.
- Schaper, Eva. Studies in Kant's Aesthetics. Edinburgh, 1979.
- Zammito, John H. The Genesis of Kant's Critique of Judgment. Chicago and London: Chicago University Press, 1992.
- Zupancic, Alenka. Ethics of the Real: Kant and Lacan. Verso, 2000.
Philosophy of religion 
- Palmquist, Stephen. Kant's Critical Religion: Volume Two of Kant's System of Perspectives. Ashgate, 2000. ISBN 0-7546-1333-X
- Perez, Daniel Omar. "Religión, Política y Medicina en Kant: El Conflicto de las Proposiciones". Cinta de Moebio. Revista de Epistemologia de Ciencias Sociales, v. 28, p. 91-103, 2007. Uchile.cl (Spanish)
Other work 
- White, Mark D. Kantian Ethics and Economics: Autonomy, Dignity, and Character. Stanford University Press, 2011. ISBN 978-0-8047-6894-8. (Reviewed in The Montreal Review)
- Braver, Lee. A Thing of This World: a History of Continental Anti-Realism. Northwestern University Press: 2007. ISBN 978-0-8101-2380-9 (This study covers Kant and his contribution to the history of Continental Anti-Realism)
- Caygill, Howard. A Kant Dictionary. Oxford, UK; Cambridge, Mass., US: Blackwell Reference, 1995. ISBN 0-631-17534-2, ISBN 0-631-17535-0
- Derrida, Jacques. Mochlos; or, The Conflict of the Faculties. Columbia University, 1980.
- Mosser, Kurt. Necessity and Possibility; The Logical Strategy of Kant's Critique of Pure Reason. Catholic University of America Press, 2008. ISBN 978-0-8132-1532-7
- Perez, D. O. . Os significados dos conceitos de hospitalidade em Kant e a problemática do estrangeiro. Revista Philosophica (Chile), v. 31, p. 43-53, 2007. Também em Konvergencias, 2007, nro. 15. UCV.cl, Konvergencias.net
- Perez, D. O. A loucura como questão semântica:uma interpretação kantiana. Trans/Form/Ação, São Paulo, 32(1): 95-117, 2009. Scielo.br
Contemporary philosophy with a Kantian influence 
- Guyer, Paul. Kant and The Claims of Taste. Harvard University Press, 1979. 2nd Edition, Cambridge University Press, 1997.
- Guyer, Paul. Kant and The Claims of Knowledge. Cambridge University Press, 1987.
- Guyer, Paul. Knowledge, Reason, and Taste: Kant's Response to Hume. Princeton University Press, 2008.
- Hanna, Robert, Kant and the Foundations of Analytic Philosophy. Clarendon Press, 2004.
- Hanna, Robert, Kant, Science, and Human Nature. Clarendon Press, 2006.
- Herman, Barbara. The Practice of Moral Judgement. Harvard University Press, 1993.
- Korsgaard, Christine. Creating the Kingdom of Ends. Cambridge; New York, NY, US: Cambridge University Press, 1996. ISBN 0-521-49644-6, ISBN 0-521-49962-3 (pbk.) (not a commentary, but a defense of a broadly Kantian approach to ethics)
- McDowell, John. Mind and World. Harvard University Press, 1994. ISBN 0-674-57609-8. (offers a Kantian solution to a dilemma in contemporary epistemology regarding the relation between mind and world)
- Parfit, Derek. On What Matters (2 vols). New York: Oxford University Press, 2011. ISBN ISBN 978-0-19-926592-3
- Pinker, Steven. The Stuff of Thought. Viking Press, 2007. ISBN 978-0-670-06327-7. (Chapter 4 "Cleaving the Air" discusses Kant's anticipation of modern cognitive science)
- Wood, Allen. Kant's Ethical Thought. Cambridge; New York, NY, US: Cambridge University Press, 1999. ISBN 0-521-64836-X. (comprehensive, in-depth study of Kant's ethics, with emphasis on formula of humanity as most accurate formulation of the categorical imperative)
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|Wikisource has original works written by or about:
- Works by Immanuel Kant at Project Gutenberg
- Works by or about Immanuel Kant in libraries (WorldCat catalog)
- Stephen Palmquist's Glossary of Kantian Terminology
- Kant's Ethical Theory Kantian ethics explained, applied and evaluated
- Kant & Ethics Extensive links and discussions from Lawrence Hinman at University of San Diego
- Notes on Deontology A conveniently brief survey of Kant's deontology
- Kant Studies Online
- Kant and Transcendental Philosophy
- Routledge Encyclopedia of Philosophy (14 sections on Kant)
- Readable versions of Prolegomena, Groundwork for the Metaphysic of Morals, Critique of Pure Reason, Metaphysical Foundations of Natural Science, The Form and Principles of the Sensible and Intelligible World, and Perpetual Peace. (J. Bennett translations)
- Kant in the Classroom background information for Kant's lectures
- Kant's Death Mask
- The Stanford Encyclopedia of Philosophy has several entries on Kant: