Researched by the Ignaria Editorial Team · Published 2026-03-12
Medieval Christian philosophy inherited both the Platonic view of the soul as naturally immortal and the Christian insistence that immortality is ultimately participatory in God's eternal life. Pseudo-Dionysius frames this as God distributing "the power to live appropriately to each" — immortality as relational gift, not autonomous property. Aquinas and Duns Scotus then provided the philosophical grounding: Scotus's formal proof runs that the intellective soul is the incorruptible specific form of man, and since the soul "does not receive perfection but communicates it," it can exist apart from the body without ceasing to be. Aquinas adds that when separated from the body, the soul "will be perfectly assimilated to the intelligences that subsist apart, and will receive their influence in more copious streams."
What the primary sources show
On the nature of the soul, its immateriality, and its natural incorruptibility — Aquinas argues that since the intellectual soul operates independently of any bodily organ, it cannot be corrupted by the body's dissolution, but it remains naturally ordered to embodiment.
"The intellective soul is the specific form of man; the intellective soul is incorruptible. From these two it follows that the specific form of man is incorruptible... the soul does not receive perfection but communicates perfection — there is nothing absurd about a thing existing apart, even though it does not communicate its perfection to another, so long as it is equally perfect." — Scotus's formal proof of the soul's immortality from its nature as an incorruptible communicating form.