That is all we need say with regard to part in material things; but part in the unembodied may be taken in various ways. We may think of it in the sense familiar in numbers, “two” a part of the standard “ten” — in abstract numbers of course — or as we think of a segment of a circle, or line [abstractly considered], or, again, of a section or branch of knowledge.
In the case of the units of reckoning and of geometrical figure, exactly as in that of corporeal masses, partition must diminish the total; the part must be less than the whole; for these are things of quantity, and have their being as things of quantity; and — since they are not the ideal-form Quantity — they are subject to increase and decrease.
Now in such a sense as this, part cannot be affirmed of the soul.
The soul is not a thing of quantity; we are not to conceive of the All-Soul as some standard ten with particular souls as its constituent units.
Such a conception would entail many absurdities:
The Ten could not be [essentially] a unity [the Soul would be an aggregation, not a self-standing Real-Being] and, further — unless every one of the single constituents were itself an All-Soul — the All-Soul would be formed of non-souls.