For the Universe is not a Principle and Source: it springs from a source, and that source cannot be the All or anything belonging to the All, since it is to generate the All, and must be not a plurality but the Source of plurality, since universally a begetting power is less complex than the begotten. Thus the Being that has engendered the Intellectual-Principle must be more simplex than the Intellectual-Principle.
We may be told that this engendering Principle is the One-and-All.
But, at that, it must be either each separate entity from among all or it will be all things in the one mass.
Now if it were the massed total of all, it must be of later origin than any of the things of which it is the sum; if it precedes the total, it differs from the things that make up the total and they from it: if it and the total of things constitute a co-existence, it is not a Source. But what we are probing for must be a Source; it must exist before all, that all may be fashioned as sequel to it.
As for the notion that it may be each separate entity of the All, this would make a self-Identity into a what you like, where you like, indifferently, and would, besides, abolish all distinction in things themselves.
Once more we see that this can be no thing among things but must be prior to all things.