Thinking is different from perceiving and is held to be in part imagination, in part judgment

All food must be capable of being digested, and that what produces digestion is warmth; that is why everything that has soul in it possesses warmth.

But nothing is yet clear on the subject of the intellect and the contemplative faculty. However, it seems to be another kind of soul, and this alone admits of being separated, as that which is eternal from that which is perishable, while it is clear from these remarks that the other parts of the soul are not separable, as some assert them to be, though it is obvious that they are conceptually distinct.

The ensouled is distinguished from the unsouled by its being alive. Now since being alive is spoken of in many ways, even if only one of these is present, we say that the thing is alive, if, for instance, there is intellect or perception or spatial movement and rest or indeed movement connected with nourishment and growth and decay. It is for this reason that all the plants are also held to be alive . . .

The soul becomes prudent by sitting and being quiet.

The soul is the form of the body