THE SOUL CAN PENETRATE THE BODY; BUT TWO BODIES CANNOT PENETRATE EACH OTHER.
(10). The soul penetrates the whole body, while an entire body cannot penetrate another entire body. Further, if the soul is corporeal, and pervades the whole body, she will, with the body, form (as Alexander of Aphrodisia pointed out) a mixture (Eneada-II-7), similar to the other bodies (that are consititued by a mixture of matter and quality, as the Stoics taught). Now as none of the bodies that enter into a mixture is in actualization! the soul, instead of being in actualization in the bodies, would be in them only potentially; consequently, she would cease to be a soul, as the sweet ceases to be sweet when mingled with the bitter; we would, therefore, have no soul left. If, when one body forms a mixture with another body, total penetration occurs, so that each molecule contains equal parts of two bodies and that each body be distributed equally in the whole space occupied by the mass of the other, without any increase of volume, nothing that is not divided will remain. Indeed, mixture operates not only between the larger parts (which would be no more than a simple juxtaposition) ; but the two bodies must penetrate each other mutually, even if smaller — it would indeed be impossible for the smaller to equal the greater; still, when the smaller penetrates the larger it must divide it entirely. If the mixture operates in this manner in every part, and if no undivided part of the mass remain, the body must be divided into points, which is impossible. Indeed, were this division pushed to infinity, since every body is fully divisible, bodies will have to be infinite not only potentially, but also in actuality. It is therefore impossible for one entire body to penetrate another in its entirety. Now as the soul penetrates the entire body, the soul must be incorporeal (as thought Nemesius — Eneada-II, 7, 1).