C. Nemesius.[363]
Aristotle says, in his Physics,[364] that the soul has five faculties, the power of growth, sensation, locomotion, appetite, and understanding. But, in his Ethics, he divides the soul into two principal parts, which are rational part, and the irrational part; then Aristotle subdivides the latter into the part that is subject to reason, and the part not subject to reason.
D. Jamblichus.[365]
The Platonists hold different opinions. Some, like Plotinos and Porphyry, reduce to a single order and idea the different functions and faculties of life; others, like Numenius, imagine them to be opposed, as if in a struggle; while others, like Atticus and Plutarch, bring harmony out of the struggle.
E. Ammonius Saccas.
A. FROM NEMESIUS.[366]
ON THE IMMATERIALITY OF THE SOUL.
It will suffice to oppose the arguments of Ammonius, teacher of Plotinos, and those of Numenius the Pythagorean, to that of all those who claim that the soul is material. These are the reasons: "Bodies, containing nothing unchangeable, are naturally subject to change, to dissolution, and to infinite divisions. They inevitably need some principle that may contain them, that may bind and strengthen their parts; this is the unifying principle that we call soul. But if the soul also be material, however subtle be the matter of which she may be composed, what could contain the soul herself, since we have just seen that all matter needs some principle to contain it? The same process will go on continuously to infinity until we arrive at an immaterial substance."
UNION OF THE SOUL AND THE BODY.
Ammonius, teacher of Plotinos, thus explained the present problem (the union of soul and body): "The intelligible is of a nature such that it unites with whatever is able to receive it, as intimately as the union of things, that mutually alter each other in uniting, though, at the same time, it remains pure and incorruptible, as do things that merely coexist.[367] Indeed, in the case of bodies, union alters the parts that meet, since they form new bodies; that is how elements change into composite bodies, food into blood, blood into flesh, and other parts of the body. But, as to the intelligible, the union occurs without any alteration; for it is repugnant to the nature of the intelligible to undergo an alteration in its essential nature. It disappears, or it ceases to be, but it is not susceptible of change. Now the intelligible cannot be annihilated; otherwise it would not be immortal; and as the soul is life, if it changed in its union with the body, it would become something different, and would no longer be life. What would the soul afford to the body, if not life? In her union (with the body, therefore), the soul undergoes no alteration.