Full Idea
There seem in a way to be an infinity of parts of the soul, and not only those that some have given, distinguishing the reasoning, spirited and desiderative parts, or with others the rational and irrational.
Clarification
'Desiderative' means 'concerning desire'. 'Soul' is the Greek word 'psuché', which covers mind and consciousness and life
Gist of Idea
The soul seems to have an infinity of parts
Source
comment on Plato (The Republic [c.374 BCE], 439b) by Aristotle - De Anima 432a25
Book Reference
Aristotle: 'De Anima (On the Soul)', ed/tr. Lawson-Tancred,H.C. [Penguin 1986], p.212
A Reaction
This seems a nice response to Plato's proposal that the psuché has two or three parts. He could have said that the soul was a unity, and has no parts, but the proposal of infinite parts seems much closer to the modern neurological view of the mind.