Full Idea
The soul is in a way all the things that exist, for all the things that exist are objects either of perception or of thought.
Gist of Idea
In a way the soul is everything which exists, through its perceptions and thoughts
Source
Aristotle (De Anima [c.329 BCE], 431b20)
Book Reference
Aristotle: 'De Anima (On the Soul)', ed/tr. Lawson-Tancred,H.C. [Penguin 1986], p.210
A Reaction
Sounds very like Berkeley's empirical version of idealism. It also seems to imply modern externalist (anti-individualist) understandings of the mind (which strike me as false).