Plotinos: Complete Works, v. 2 In Chronological Order,...

When a being participates in something, evidently it does not participate in itself; for thus it would really participate in nothing, and would remain what it was. The body that participates in something must, therefore, not participate in corporeal nature, for it possesses it already. Consequently, the body will not participate in the corporeal nature, any more than a magnitude would participate in a magnitude, which it possesses already. Let us even admit that a magnitude be increased, yet on that account alone it would not participate in magnitude; for a two-foot object does, not become a three-foot object, but the object which first had a certain quantity merely changes to some other quantity; otherwise two would become three. Thus, since that which has extension and is divided participates in genus that is different, and even very different, the thing in which it participates must neither be divided, nor have extension; but have absolutely no kind of quantity. Consequently, the (being) which everywhere is present entire must be present, though remaining indivisible. It is not indivisible merely because it is small, which would not make it any less divisible; only, it would no more be proportioned to the universe, it would not spread in the corporeal mass in the degree that it increases. Neither does it resemble a point, but it includes an infinity of points; consequently what you might suppose was a point would include an infinity of (separate) points, and could not be continuous, nor, consequently, proportion itself to the universe.