Book 4
7
Nor, as is obvious, are those right who say that all things are at rest; nor those who say that all things are in motion. For if all things are at rest, the same things will always be true and false, whereas this state of affairs is obviously subject to change; for the speaker himself once did not exist, and again he will not exist. And if all things are in motion, nothing will be true, so everything will be false; but this has been proved to be impossible.
8
Again, it must be that which is that changes, for change is from something into something. And further, neither is it true that all things are at rest or in motion sometimes, but nothing continuously; for there is something The sphere of the fixed stars; cf. Aristot. Met. 12.6, 12.7.1, 12.8.18. which always moves that which is moved, and the prime mover is itself unmoved.Cf. Aristot. Met. 12.7.
