The synthetic genius of Plotinus enabled him to weave into his system valuable elements from Aristotle and the Stoics. But he was above all a Platonist. He presents the spiritual triad: the One, the Mind, the Soul. From the One comes the Mind, that is, the Nous, which embraces the totality of the knowable or intelligible, to wit, the Cosmos of Ideas. From that, come the Soul of the World and the souls of men. Matter, which is no-thing, gains form and partial reality when informed with soul. Plotinus's attitude toward knowledge of the concrete natural or historic fact, displays a transcendental indifference exceeding that of Plato. Perceptible facts with him are but half-real manifestations of the informing spirit. They were quite plastic, malleable, reducible. Moreover, thoughts of the evil of the multiple world of sense held for Plotinus and his followers a bitterness of ethical unreality which Plato was too great an Athenian to feel.