WHY THE HEAVENS DO NOT REMAIN STILL.
The heavens would be immovable if the Soul rested, that is, if she remained only in the intelligible world, where everything remains immovable. But because the Soul is in no one determinate place, and because the whole of her is everywhere, the heavens move through the whole of space; and as they cannot go out of themselves, they must move in a circle.
HOW OTHER BEINGS MOVE.[314]
2. How do the other beings move? As none of them is the whole, but only a part, consequently, each finds itself situated in a particular place. On the contrary, the heavens are the whole; they constitute the place which excludes nothing, because it is the universe. As to the law according to which men move, each of them, considered in his dependence towards the universe, is a part of all; considered in himself, he is a whole.