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Wellsprings
soul

Soul as Form of the Body

ἐντελέχεια

Aristotle coined a word for a thing's 'completed actuality' — and used it to define the soul as the very being-at-work of a living body.

Aristotle developed the concept of entelechy (ἐντελέχεια) to solve a puzzle about how the soul relates to the body. Rather than treating the soul as a separate ghost trapped inside flesh, he argued the soul is the form or organizing principle that makes a body alive—much like the shape of a statue is what makes marble into a statue. The soul is the "first actuality" of a living body, meaning it's what gives the body its fundamental capacity for life and function. Without the soul, you have only dead matter; with it, you have something that can grow, perceive, think, and move.

This idea had practical implications for how people understood life and death. When a person died, they weren't losing some invisible passenger; their soul departed because the body's organization had broken down beyond repair. A hand severed from the body is no longer truly a hand, since it's lost the organized form that made it capable of grasping. Similarly, the soul of a plant is simply whatever makes a plant grow and nourish itself, while an animal's soul adds sensation and locomotion on top. Entelechy meant the soul and body were genuinely unified, not two separate substances fighting for control.

Where this idea shows up

15 Greek sources

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