19. Are we to think of the indivisible phase of the soul and the divided as making one thing in a coalescence; or is the indivisible in a place of its own and under conditions of its own, the divisible being a sequent upon it, a separate part of it, as distinct as the reasoning phase is from the unreasoning?
The answer to this question will emerge when we make plain the nature and function to be attributed to each.
The indivisible phase is mentioned [in the passage of Plato] without further qualification; but not so the divisible; “that soul” we read “which becomes divisible in bodies” — and even this last is presented as becoming partible, not as being so once for all.
“In bodies”: we must then, satisfy ourselves as to what form of soul is required to produce life in the corporeal, and what there must be of soul present throughout such a body, such a completed organism.