Aristotle had been as obsessed with perfection as his great teacher—witness his views on astronomy. But he was also willing to shrug and say: Look, if it exists, there must be a reason. In Aristotle’s mind, viewing the world as a copy of anything—even the mind of God—gets us nowhere. It is arguable whether Aristotle even had a conception of a God, but he did have a Prime Mover without whom nothing else moves.

