Aristotle · Philosophy
What makes a body alive - and why the soul is no inner spirit.
A blind eye is still an eye, but only in name. The shape is all there; the seeing has gone. Ask what left, and you are asking Aristotle’s question about living bodies: what does a body lose in the moment it stops being alive?
The Greeks called the missing thing psyche - soul, the principle of life. In On the Soul, Aristotle gives it a definition that fits no ghost story. The soul is the form of the living body: its organisation, its capacities, the functions that make this matter able to grow, perceive, move, and think. Not a spirit in occupation of the body - not a separate thing at all. Sight stands to the eye as soul stands to the body, and nobody imagines sight as a tenant of the eyeball.
Which makes dying a stranger event than it looks.
Aristotle’s definition refuses both of the answers already on offer. Dualism - the soul as a separate spirit - made it an immaterial thing that inhabits a body for a time and can leave it. That was Plato’s picture, and it returned with greater force in Rene Descartes, who split the human being into two substances: an immaterial thinking thing housed in a material extended one. Crude materialism - life as mere matter - claimed the opposite, that a living thing is nothing but its physical composition.
Against the spirit: soul can no more exist apart from its body than cutting can exist apart from an axe, or seeing apart from an eye. Against mere matter: a living body is not simply stuff, but stuff organised and actualised by a form, and that organisation is exactly what a corpse has lost.
So the soul is the form and functioning of the living body - a middle way between the separate spirit and the mere matter. The stakes here belong to Descartes. If mind and body really are two substances, then soul-as-form is a misdescription of the mind, and a soul might exist apart from its body after all. Can one definition cover the fern, the falcon, and the philosopher alike?
This is the opening of the lesson. The rest — the dialogue, the primary source, and the recall — is in the app.
You studied Aristotle’s account of the soul in On the Soul . From memory: state his definition of the soul, the two rival views it steers between, and how perception feeds his theory of knowledge.
Leads to Gilbert Ryle.
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