  This disagreement between Plato and Aristotle is ultimately due to a different view about the first principles of all things. Aristotle denies the existence of Platonic Forms and therefore cannot admit an efficient or creative cause of the universe in the true sense of the word. Efficient causality only concerns the sublunary world. The celestial bodies and the world as a whole have no efficient cause of their being, but only a final cause. From this misunderstanding about the first principles follow all the other views that distinguish Aristotle from Plato. One gets the impression, Proclus says, that Aristotle, because he could not grasp the first principle of all things - the One – has always to find an explanation of things on a lower level: