III continued. Among the Greeks Plato and Aristotle held soul-immortality certain and clear

Among the Greeks, among the chiefs of philosophers, for Socratic Plato and for Aristotle the immortality of the soul was a certain and clear thing. For even Cicero, however devoted to the Stoics, thinks those who dissent from Plato and Socrates and from that family ought to be called plebeian philosophers (Tusculan Disputations book 1). Plato pursues this matter expressly in the Phaedo, which when read Cleombrotus of Ambracia, as the same Cicero reports from Callimachus's epigram, though nothing adverse had befallen him, threw himself from a wall into the sea — whom Jerome in letter 25 calls a martyr of foolish philosophy. See also, if you please, Plato in the Phaedrus, Timaeus, Philebus, and Republic; and among Platonists above the rest Marsilio Ficino in Platonic Theology, or On the Immortality of the Soul, a far most learned treatise.

Aristotle left contexts not to be despised for the immortality of the soul in the books On the Soul: book 1, contexts 65 and 66 — he says the intellect does not perish, is something divine and impassible; book 2, context 21 — that the intellect is a diverse genus of the soul, and this alone is separated, as eternal from corruptible; book 3, contexts 4, 6, 7, and 19 — he teaches that it, since it understands universals, is neither mixed nor corporeal; likewise separable from the body, though sense cannot be separated. And context 20 he expressly says immortal and eternal. And On the Generation of Animals book 2, chapter 3: It remains that the intellect alone enters from outside and alone is divine. For it has nothing in common by its act with bodily act.