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Arguments for eternity composed a particularly important area of philosophical debate among Greek, Jewish, Islamic, and Christian philosophers during the ancient and medieval periods. The foremost philosopher arguing for eternity was Aristotle. Those subscribing to Creationism ex nihilo (that is, creation from nothing) challenged these arguments for eternity, and held instead that God created the universe, so that the universe had a definite beginning in time.

From the nature of the physical world[edit]

Argument from the nature of matter[edit]

The argument from the nature of matter, made by Aristotle in Physics, proceeds as follows:

Everything that comes into existence does so from a substratum. If the underlying matter of the universe came into existence, it would come into existence from a substratum. But the nature of matter is precisely to be the substratum from which other things arise. Consequently, the underlying matter of the universe could have come into evidence only from an already existing matter exactly like itself; to assume that the underlying matter of the universe came into existence would require assuming that an underlying matter already existed. The assumption is thus self-contradictory, and matter must be eternal.[1]

The key premise of the argument is, clearly, that everything that comes into existence does so from a substratum. Aristotle defends this argument inductively as follows:

"We can," he argued, "always observe something underlying, from which the generated object comes, plants and animals, for example, coming from seed."[2]
Further, the impossibility "that generation should take place from nothing" is self-evident.[3]

Maimonides challenged the inductive assertion on that "everything in existence comes from a substratum," on that basis that his reliance on induction and analogy is a fundamentally flawed means of explaining unobserved phenomenon. According to Maimonides, to argue that "because I have never observed something coming into existence without coming from a substratum it cannot occur" is equivalent to arguing that "because I cannot empirically observe eternity it does not exist."

Argument from possibility[edit]

The medieval philosopher Avicenna argued as follows:[citation needed]

Prior to a thing's coming into actual existence, its existence must have been 'possible.' Were its existence necessary, the thing would already have existed, and were its existence impossible, the thing would never exist. The possibility of the thing must therefore in some sense have its own existence. Possibility cannot exist in itself, but must reside within a subject. If an already existent matter must precede everything coming into existence, clearly nothing, including matter, can come into existence ex nihilo, that is, from absolute nothingness. An absolute beginning of the existence of matter is therefore impossible.

The argument is challenged on the basis that the "possibility" of creation could be ascribed to the Creator,[original research?] and on the basis that the concept of "possibility" is merely an intellectual judgment with no actual existence in any real sense.[original research?]

Argument from motion[edit]

The argument from motion, made by Aristotle, proceeds as follows: If an absolute beginning of motion should be assumed, the object to undergo the first motion must either

(A) have come into existence and begun to move, or
(B) have existed in an eternal state of rest before beginning to move.[4]

Aristotle argues that option A is self-contradictory because an object cannot move before it comes into existence, and the act of coming into existence is itself a "movement," so that the first movement requires a movement before it, that is, the act of coming into existence.

Aristotle argues that option B is unsatisfactory for two reasons.

  • First, if the world began at a state of rest, the coming into existence of that state of rest would itself have been motion.
  • Second, if the world changed from a state of rest to a state of motion, the cause of that change to motion would itself have been a motion.

Aristotle concludes that motion is necessarily eternal.

Creationists responded that the "First motion" could be ascribed to God's creative act (which would, of course, be transcendental and thus not necessarily physical in nature).

Argument from the vacuum[edit]

Aristotle argued that a "vacuum" (that is, a place where there is no matter) is impossible. Material objects can come into existence only in place, that is, occupy space. Were something to come from nothing, "the place to be occupied by what comes into existence would previously have been occupied by a vacuum, inasmuch as no body existed." But a vacuum is impossible, and matter must be eternal.

Creationists responded that God created the dimensions at the same time he created the matter, so there was no vacuum before there was matter.

See also[edit]


  1. ^ Aristotle in Physics I, 7
  2. ^ Aristotle in Physics I, 7, 190b, 3-5.
  3. ^ Aristotle in Metaphysics III, 4, 999b, 8.
  4. ^ Aristotle in Physics VIII, 1, 251a, 8-20

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