Enneads II.4: Of Matter
The Categories of Movement and Difference Applied to Intelligibles
The difference that is in the intelligible world ever produces matter; for, in that world, it is the difference that is the principle of matter, as well as of primary motion. That is why the latter is also called difference, because difference and primary motion were born simultaneously.
The movement and difference, that proceed from the First (the Good), are indeterminate, and need it, to be determinate. Now they determine each other when they turn towards it. Formerly, matter was as indeterminate as difference; it was not good because it was not yet illuminated by the radiance of the First. Since the First is the source of all light, the object that receives light from the First does not always possess light; this object differs from light, and possesses light as something alien, because it derives light from some other source. That is the nature of matter as contained in intelligible (entities). Perhaps this treatment of the subject is longer than necessary.
SUBSTRATE IS DEMANDED BY TRANSFORMATION OF ELEMENTS, BY THEIR DESTRUCTION AND DISSOLUTION.
6. Now let us speak of bodies. The mutual transformation of elements demonstrates that they must have a substrate. Their transformation is not a complete destruction; otherwise (a general) “being” would perish in nonentity. Whereas, what is begotten would have passed from absolute nonentity to essence; and all change is no more than the passing of one form into another (as thought Aristotle). It presupposes the existence of permanent (subject) which would receive the form of begotten things only after having lost the earlier form. This is demonstrated by destruction, which affects only something composite; therefore every dissolved object must have been a composite. Dissolution proves it also. For instance, where a vase is dissolved, the result is gold; on being dissolved, gold leaves water; and so analogy would suggest that the dissolution of water would result in something else, that is analogous to its nature. Finally, elements necessarily are either form, or primary matter, or the composites of form and matter. However, they cannot be form, because, without matter, they could not possess either mass nor magnitude. Nor can they be primary matter, because they are subject to destruction. They must therefore be composites of form and matter; form constituting their shape and quality, and matter a substrate that is indeterminate, because it is not a form.