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William of Ockham
William of Ockham.png
Born c. 1287
Ockham, England
Died 1347
Munich, Holy Roman Empire
Era Medieval Philosophy
Region Western Philosophy
School Scholasticism
Main interests Metaphysics, Epistemology, Theology, Logic, Ontology, Politics
Notable ideas Occam's Razor, Nominalism
William of Ockham – Sketch labelled "frater Occham iste", from a manuscript of Ockham's Summa Logicae, 1341

William of Ockham (/ˈɒkəm/; also Occam; c. 1287 – 1347) was an English Franciscan friar and scholastic philosopher and theologian, who is believed to have been born in Ockham, a small village in Surrey.[1] He is considered to be one of the major figures of medieval thought and was at the centre of the major intellectual and political controversies of the fourteenth century. He is commonly known for Occam's razor, the methodological principle that bears his name, and also produced significant works on logic, physics, and theology. In the Church of England, his day of commemoration is 10 April.[2]


William of Ockham joined the Franciscan order at an early age. It is believed that he studied theology at the University of Oxford from 1309 to 1321, but while he completed all the requirements for a master's degree in theology (the 14th century equivalent of a doctorate[citation needed]) he was never made regent master.[3] Because of this, he acquired the honorific title Venerabilis Inceptor, or "Venerable Beginner" (an inceptor was a student formally admitted to the ranks of teachers by the university authorities[4]). He was also known as the Doctor Invincibilis or "Unconquerable Teacher."

His work in this period became the subject of controversy, and Ockham was summoned before the Papal court of Avignon in 1324 under charges of heresy. During the Middle Ages, theologian Peter Lombard's Sentences (1150) had become a standard work of theology, and many ambitious theological scholars wrote commentaries on it.[5] William of Ockham was among these scholarly commentators. However, Ockham's commentary was not well received by his colleagues,[citation needed] or by the Church authorities. In 1324, his commentary was condemned as unorthodox by a synod of bishops[citation needed], and he was ordered to Avignon, France, to defend himself before a papal court.[5] For two years, he was confined to a Franciscan house,[citation needed] until he was condemned as a heretic in 1326.

An alternative understanding, recently proposed by George Knysh, suggests that he was initially appointed in Avignon as a professor of philosophy in the Franciscan school, and that his disciplinary difficulties did not begin until 1327.[6] It is generally believed that these charges were levied by Oxford chancellor John Lutterell.[7] The Franciscan Minister General, Michael of Cesena, had been summoned to Avignon, to answer charges of heresy. A theological commission had been asked to review his Commentary on the Sentences, and it was during this that Ockham found himself involved in a different debate. Michael of Cesena had asked Ockham to review arguments surrounding Apostolic poverty. The Franciscans believed that Jesus and his apostles owned no property either individually or in common, and The Rule of Saint Francis commanded members of the order to follow this practice.[8] This brought them into conflict with Pope John XXII.

Because of the pope's attack on the Rule of Saint Francis, Ockham, Michael of Cesena and other leading Franciscans fled Avignon on 26 May 1328, and eventually took refuge in the court of the Holy Roman Emperor Louis IV of Bavaria - who was also engaged in dispute with the papacy, and became Ockham's patron.[5] After studying the works of John XXII and previous papal statements, Ockham agreed with the Minister General. In return for protection and patronage Ockham wrote treatises that argued for emperor Louis to have supreme control over church and state in the Holy Roman Empire.[5] "On June 6, 1328, Ockham was officially excommunicated for leaving Avignon without permission,"[3] and Ockham argued that John XXII was a heretic for attacking the doctrine of Apostolic poverty and the Rule of Saint Francis, which had been endorsed by previous popes.[3] Ockham's philosophy was never officially condemned.[3]

He spent much of the remainder of his life writing about political issues, including the relative authority and rights of the spiritual and temporal powers. After Michael of Cesena's death in 1342, William became the leader of the small band of Franciscan dissidents living in exile with Louis IV. Ockham died (prior to the outbreak of the plague, or Black Death) on 10 April 1347.[9] He was officially rehabilitated by Innocent VI in 1359.

Faith and reason[edit]

William of Ockham believed "only faith gives us access to theological truths. The ways of God are not open to reason, for God has freely chosen to create a world and establish a way of salvation within it apart from any necessary laws that human logic or rationality can uncover." [10] Ockham's theism was based solely on private revelation[citation needed] and faith[citation needed][citation needed] (fideism). He believed that only science was a matter of discovery and saw God as the only ontological necessity.[11]

Philosophical thought[edit]

In scholasticism, Ockham advocated a reform both in method and in content, the aim of which was simplification. Ockham incorporated much of the work of some previous theologians, especially John Duns Scotus. From Scotus, Ockham derived his view of divine omnipotence, his view of grace and justification, much of his epistemology[citation needed] and ethical convictions. However, he also reacted to and against Scotus in the areas of predestination, penance, his understanding of universals, his formal distinction ex parte rei (that is, "as applied to created things"), and his view of parsimony.


Ockham was a pioneer of nominalism, and some consider him the father of modern epistemology, because of his strongly argued position that only individuals exist, rather than supra-individual universals, essences, or forms, and that universals are the products of abstraction from individuals by the human mind and have no extra-mental existence.[12] He denied the real existence of metaphysical universals and advocated the reduction of ontology. Ockham is sometimes considered an advocate of conceptualism rather than nominalism, for whereas nominalists held that universals were merely names, i.e. words rather than existing realities, conceptualists held that they were mental concepts, i.e. the names were names of concepts, which do exist, although only in the mind. Therefore, the universal concept has for its object, not a reality existing in the world outside us, but an internal representation which is a product of the understanding itself and which "supposes" in the mind the things to which the mind attributes it; that is, it holds, for the time being, the place of the things which it represents. It is the term of the reflective act of the mind. Hence the universal is not a mere word, as Roscelin taught, nor a sermo, as Abelard held, namely the word as used in the sentence, but the mental substitute for real things, and the term of the reflective process. For this reason Ockham has sometimes also been called a "terminist", to distinguish him from a nominalist or a conceptualist.[13]

Ockham was a theological voluntarist who believed that if God had wanted to, he could have become incarnate as a donkey or an ox, or even as both a donkey and a man at the same time. He was criticized for this belief by his fellow theologians and philosophers.[14]

Efficient reasoning[edit]

One important contribution that he made to modern science and modern intellectual culture was efficient reasoning with the principle of parsimony in explanation and theory building that came to be known as Occam's Razor. This maxim, as interpreted by Bertrand Russell,[15] states that if one can explain a phenomenon without assuming this or that hypothetical entity, there is no ground for assuming it, i.e. that one should always opt for an explanation in terms of the fewest possible causes, factors, or variables. He turned this into a concern for ontological parsimony; the principle says that one should not multiply entities beyond necessity – Entia non sunt multiplicanda sine necessitate – although this well-known formulation of the principle is not to be found in any of Ockham's extant writings.[16] He formulates it as: "For nothing ought to be posited without a reason given, unless it is self-evident (literally, known through itself) or known by experience or proved by the authority of Sacred Scripture."[17] For Ockham, the only truly necessary entity is God; everything else is contingent. He thus does not accept the principle of sufficient reason, rejects the distinction between essence and existence, and advocates against the Thomistic doctrine of active and passive intellect. His scepticism to which his ontological parsimony request leads appears in his doctrine that human reason can prove neither the immortality of the soul nor the existence, unity, and infinity of God. These truths, he teaches, are known to us by revelation alone.

Natural philosophy[edit]

Ockham wrote a great deal on natural philosophy, including a long commentary on Aristotle's Physics. According to the principle of ontological parsimony, he holds that we do not need to allow entities in all ten of Aristotle's categories; we thus do not need the category of quantity, as the mathematical entities are not "real". Mathematics must be applied to other categories, such as the categories of substance or qualities, thus anticipating modern scientific renaissance while violating Aristotelian prohibition of metabasis.

Theory of knowledge[edit]

In the theory of knowledge, Ockham rejected the scholastic theory of species, as unnecessary and not supported by experience, in favour of a theory of abstraction. This was an important development in late medieval epistemology. He also distinguished between intuitive and abstract cognition; intuitive cognition depends on the existence or non existence of the object, whereas abstractive cognition "abstracts" the object from the existence predicate. Interpreters are, as yet, undecided about the roles of these two types of cognitive activities.

Political theory[edit]

Ockham is also increasingly being recognized as an important contributor to the development of Western constitutional ideas,[citation needed] especially those of government with limited responsibility.[citation needed] He was one of the first medieval authors to advocate a form of church/state separation,[citation needed] and was important for the early development of the notion of property rights. His political ideas are regarded as "natural" or "secular",[citation needed] holding for a secular absolutism.[citation needed] The views on monarchical accountability espoused in his Dialogus (written between 1332 and 1347)[18] greatly influenced the Conciliar movement and assisted in the emergence of liberal democratic ideologies.[citation needed]


In logic, Ockham wrote down in words the formulae that would later be called De Morgan's Laws,[19] and he pondered ternary logic, that is, a logical system with three truth values; a concept that would be taken up again in the mathematical logic of the 19th and 20th centuries. His contributions to semantics, especially to the maturing theory of supposition, are still studied by logicians.[20][21] Ockham was probably the first logician to treat empty terms in Aristotelian syllogistic effectively; he devised an empty term semantics that exactly fit the syllogistic. Specifically, an argument is valid according to Ockham's semantics if and only if it is valid according to Prior Analytics.[22]

Literary Ockhamism/nominalism[edit]

Ockham and his works have been discussed as a possible influence on several late medieval literary figures and works, especially Geoffrey Chaucer, but also Jean Molinet, the Gawain poet, François Rabelais, John Skelton, Julian of Norwich, the York and Townely Plays, and Renaissance romances. Only in very few of these cases is it possible to demonstrate direct links to Ockham or his texts. Correspondences between Ockhamist and Nominalist philosophy/theology and literary texts from medieval to postmodern times have been discussed within the scholarly paradigm of literary nominalism.[23] Erasmus criticized him together with Duns Scot as fuelling unnessary controversies inside the Church in his Praise of Folly.


The standard edition of his philosophical and theological works is William of Ockham: Opera philosophica et theologica, Gedeon Gál, et al., eds. 17 vols. St. Bonaventure, N. Y.: The Franciscan Institute, 1967–88. For his political works, all but the Dialogus have been edited in William of Ockham, H. S. Offler, et al., eds. 4 vols., 1940–97, Manchester: Manchester University Press [vols. 1–3]; Oxford: Oxford University Press [vol. 4].

Philosophical writings[edit]

  • Summa logicae (c. 1323), Paris 1448, Bologna 1498, Venice 1508, Oxford 1675.
  • Quaestiones in octo libros physicorum (before 1327), Rome 1637.
  • Summulae in octo libros physicorum (before 1327), Venice 1506.
  • Quodlibeta septem (before 1327), Paris 1487.
  • Expositio aurea super artem veterem Aristotelis, 1323.
  • Major summa logices, Venice 1521.
  • Quaestiones in quattuor libros sententiarum, Lyons, 1495.
  • Centilogium theologicum, Lyons 1495.

Theological writings[edit]

  • Questiones earumque decisiones, Lyons 1483.
  • Quodlibeta septem, Paris 1487, Strasbourg 1491.
  • Centilogium, Lyons 1494.
  • De sacramento altaris and De corpore christi, Strasbourg 1491, Venice 1516.
  • Tractatus de sacramento allans.

Political writings[edit]

  • Opus nonaginta dierum (1332), Leuven 1481, Lyons 1495.
  • Dialogus (begun in 1332), Paris 1476. Lyons 1495.
  • Super potestate summi pontificis octo quaestionum decisiones (1344).
  • Tractatus de dogmatibus Johannis XXII papae (1333–34).
  • Epistola ad fratres minores (1334).
  • De jurisdictione imperatoris in causis matrimonialibus, Heidelberg 1598.
  • Breviloquium de potestate tyrannica (1346).
  • De imperatorum et pontifcum potestate [also known as 'Defensorium'] (1347).

See also[edit]


  1. ^ There are claims also that he was born in Ockham, Yorkshire but it is now accepted that his birth place was in Surrey. See Wood, Rega (1997). Ockham on the Virtues. Purdue University Press. pp. 3, 6–7n1. ISBN 978-1-55753-097-4. 
  2. ^ "Holy Days". Liturgical Calendar. Church of England. Retrieved 12 May 2013. 
  3. ^ a b c d Spade, Paul Vincent. "William of Ockham". Stanford Encyclopedia of Philosophy. Stanford University. Retrieved 2006-10-22. 
  4. ^ Brundage, James (2008). "Canon Law in the Law schools", in The history of medieval canon law in the classical period. Catholic University of America Press (Wilfried Hartmann & Kenneth Pennington, eds.). p. 115. ISBN 0813214912. 
  5. ^ a b c d Roger Olson. The Story of Christian Theology, p. 350. ISBN 0-8308-1505-8
  6. ^ Knysh, George, Biographical rectifications concerning Ockham's Avignon period. Franciscan Studies 46, pp.61–91.
  7. ^ Hundersmarck, Lawrence (1992). Great Thinkers of the Western World. Harper Collins. pp. 123–128. ISBN 0-06-270026-X. 
  8. ^ McGrade, Arthur (1974). The Political Thought of William of Ockham: Personal and Institutional Principles. Cambridge University Press. ISBN 0-521-20284-1. 
  9. ^ Gál, Gedeon, 1982. William of Ockham Died Impenitent in April 1347. Franciscan Studies 42, pp. 90–95
  10. ^ Dale T. Irvin & Scott W. Sunquist. History of World Christian Movement Volume I: Earliest Christianity to 1453, p. 434. ISBN 9781570753961
  11. ^ Standford Encyclopedia of Philosophy on William Ockham
  12. ^ Baird, Forrest E.; Walter Kaufmann (2008). From Plato to Derrida. Upper Saddle River, New Jersey: Pearson Prentice Hall. ISBN 0-13-158591-6. 
  13. ^ Wikisource-logo.svg William Turner (1913). "William of Ockham". Catholic Encyclopedia. New York: Robert Appleton Company. 
  14. ^ Stanley J. Grenz. The Named God and the Question Of Being: A Trinitarian Theo-Ontology. 
  15. ^ Russell, Bertrand (2000). History of Western Philosophy. Allen & Unwin. pp. 462–463. ISBN 0-415-22854-9. 
  16. ^ W. M. Thorburn (1918). "The Myth of Occam's Razor". Mind 27 (107): 345–353. doi:10.1093/mind/XXVII.3.345. Retrieved 2006-10-25. 
  17. ^ Spade, Paul Vincent. The Cambridge Companion to Ockham. Cambridge University Press, 1999: 104.
  18. ^ Cf. the online British Academy edition at http://www.britac.ac.uk/pubs/dialogus/ockdial.html
  19. ^ In his Summa Logicae, part II, sections 32 & 33.Translated on page 80 of Philosophical Writings, tr. P. Boehner, rev. S. Brown, (Indianapolis, IN, 1990)
  20. ^ Graham Priest; Read, S. (1977). "The Formalization of Ockham's Theory of Supposition". Mind. LXXXVI (341): 109–113. doi:10.1093/mind/LXXXVI.341.109. 
  21. ^ JOHN CORCORAN AND JOHN SWINIARSKI. 1978. Logical Structures of Ockham's Theory of Supposition, Franciscan Studies 38, 161–83.
  22. ^ John Corcoran .1981.Ockham's Syllogistic Semantics, Journal of Symbolic Logic, 46 (1981) 197–198.
  23. ^ William H. Watts and Richard J. Utz, "Nominalist Influence on Chaucer's Poetry: A Bibliographical Essay," Medievalia & Humanistica 20 n.s. (1993), 147–73; Helen Ruth Andretta, Chaucer's 'Troilus and Criseyde.' A Poet's Response to Ockhamism (New York: Lang, 1997).



  • Demonstration and scientific knowledge in William of Ockham: a translation of Summa logicae III-II, De syllogismo demonstrativo, and selections from the Prologue to the Ordinatio, translated by John Lee Longeway, (Notre Dame, IN: University of Notre Dame, 2007)
  • An princeps pro suo succursu, scilicet guerrae, possit recipere bona ecclesiarum, etiam invito papa, translated in Political thought in early fourteenth-century England: treatises by Walter of Milemete, William of Pagula, and William of Ockham, translated by Cary J. Nederman, (Tempe, AZ: Arizona Center for Medieval and Renaissance Studies, 2002)
  • A translation of William of Ockham's Work of ninety days, translated by John Kilcullen and John Scott, (Lewiston, NY: E. Mellen Press, 2001) [translation of Opus nonaginta dierum]
  • Tractatus de principiis theologiae, translated in A compendium of Ockham's teachings: a translation of the Tractatus de principiis theologiae, translated by Julian Davies, (St. Bonaventure, NY: Franciscan Institute, St. Bonaventure University, 1998)
  • On the power of emperors and popes, translated by Annabel S. Brett, (Bristol, 1998)
  • Rega Wood, Ockham on the Virtues, (West Lafayette, IN: Purdue University Press, 1997) [includes translation of On the Connection of the Virtues]
  • A letter to the Friars Minor, and other writings, translated by John Kilcullen, (Cambridge: Cambridge University Press, 1995) [includes translation of Epistola ad Fratres Minores]
  • Paul Spade, Five Texts on the Mediaeval Problem of Universals: Porphyry, Boethius, Abelard, Duns Scotus, Ockham, (Indianapolis, IN: Hackett, 1994)
  • A short discourse on the tyrannical government, translated by John Kilcullen, (Cambridge: Cambridge University Press, 1992) [translation of Breviloquium de principatu tyrannico]
  • Quodlibetal questions, translated by Alfred J Freddoso and Francis E Kelley, 2 vols, (New Haven; London: Yale University Press, 1991) (translation of Quodlibeta septem)
  • Philosophical Writings, tr. P Boehner, rev. S Brown, (Indianapolis, IN, 1990)
  • Ockham on Aristotle's Physics: A Translation of Ockham's Brevis Summa Libri Physicorum, translated by Julian Davies, (St. Bonaventure, NY: The Franciscan Institute, 1989)
  • Ockham's theory of terms: part I of the Summa logicae, translated by Michael J. Loux, (Notre Dame; London: University of Notre Dame Press, 1974) [translation of Summa logicae, part 1]
  • Ockham's theory of propositions: part II of the Summa logicae, translated by Alfred J. Freddoso and Henry Schuurman, (Notre Dame: University of Notre Dame Press, 1980) [translation of Summa logicae, part 2]
  • Kluge, Eike-Henner W., William of Ockham's Commentary on Porphyry: Introduction and English Translation, Franciscan Studies 33, pp. 171–254, and 34, pp. 306–82, (1973-4)
  • Predestination, God's foreknowledge, and future contingents, translated by Marilyn McCord Adams and Norman Kretzmann, (New York: Appleton-Century-Crofts, 1969) [translation of Tractatus de praedestinatione et de praescientia Dei et de futuris contigentibus]
  • The De sacramento altaris of William of Ockham, translated by T Bruce Birch, (Burlington, Iowa: Lutheran Literary Board, 1930) [translation of Treatise on Quantity and On the Body of Christ]
  • William of Ockham, [Question One of] Eight Questions on the Power of the Pope, translated by Jonathan Robinson, available online: http://individual.utoronto.ca/jwrobinson/#Translations

Further reading[edit]

External links[edit]

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