WHY THE HEAVENS DO NOT REMAIN STILL.
Project Gutenberg EPUB3 edition
Plotinus and Guthrie, Kenneth Sylvan
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.