Living Parts

If life is essentially self-motion, then living things must contain within themselves a certain amount of heterogeneity. Remember that motion is the reduction of some potency to act, so in a being that moves itself, some parts must be in potency and other must be in act. No one part can be in both potency and act in the same way. A unified being endowed with self-motion, a living thing, then, is composed of heterogeneous parts.

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