He was determined to establish the essential role of a divinity who is the final cause of everything, the one who sets the whole system in motion, the master engineer. Aristotle’s term for this God is the Unmoved Mover or Prime Mover, since He presides over everything that changes or moves in the universe, without changing or moving Himself. He alone has already achieved His actuality, or energeia, simply by being. He thinks, and everything moves.
