Kitap 12
17
It is evident that there is only one heaven.This paragraph seems to belong to an earlier period of Aristotle’s thought. At any rate the argument that plurality involves matter is inconsistent with the view that there are 55 immaterial movers. For if there is to be a plurality of heavens (as there is of men), the principle of each must be one in kind but many in number.
18
But all things which are many in number have matter (for one and the same definition applies to many individuals, e.g. that of man; but Socrates is oneThe definition or form is one and universal; it is the combination of form with matter that constitutes an individual. Thus a plurality of individuals is caused by the combination of the same form with different matter.), but the primary essence has no matter, because it is complete reality. Therefore the prime mover, which is immovable, is one both in formula and in number; and therefore so also is that which is eternally and continuously in motion. Therefore there is only one heaven.
