MacKenna-Plotinus: intellects

So with Intellect. Intellect as a whole must be thought of as prior to the intellects actualized as individuals; but when we come to the particular intellects, we find that what subsists in the particulars must be maintained from the totality. The Intellect subsisting in the totality is a provider for the particular intellects, is the potentiality of them: it involves them as members of its universality, while they in turn involve the universal Intellect in their particularity, just as the particular science involves science the total. Enneads   VI,2,20

The great Intellect, we maintain, exists in itself and the particular intellects in themselves; yet the particulars are embraced in the whole, and the whole in the particulars. The particular intellects exist by themselves and in another, the universal by itself and in those. All the particulars exist potentially in that self-existent universal, which actually is the totality, potentially each isolated member: on the other hand, each particular is actually what it is [its individual self], potentially the totality. In so far as what is predicated of them is their essence, they are actually what is predicated of them; but where the predicate is a genus, they are that only potentially. On the other hand, the universal in so far as it is a genus is the potentiality of all its subordinate species, though none of them in actuality; all are latent in it, but because its essential nature exists in actuality before the existence of the species, it does not submit to be itself particularized. If then the particulars are to exist in actuality - to exist, for example, as species - the cause must lie in the Act radiating from the universal. Enneads VI,2,20

This intellect, then, to which we ascribe perception, though not divorced from the prior in which it originates, evolves plurality out of unity and has bound up with it the principle of Difference: it therefore takes the form of a plurality-in-unity. A plurality-in-unity, it produces the many intellects by the dictate of its very nature. Enneads VI,2,22

Now Soul has Intellect for its prior, is therefore circumscribed by number down to its ultimate extremity; at that point infinity is reached. The particular intellect, though all-embracing, is a partial thing, and the collective Intellect and its various manifestations [all the particular intellects] are in actuality parts of that part. Soul too is a part of a part, though in the sense of being an Act [actuality] derived from it. When the Act of Intellect is directed upon itself, the result is the manifold [particular] intellects; when it looks outwards, Soul is produced. Enneads VI,2,22

But why should it not be simply a dyad? Because neither of the constituents could ever be a pure unity, but at the very least a duality and so progressively [in an endless dualization]. Besides, in that first duality of the hypothesis there would be also movement and rest, Intellect and the life included in Intellect, all-embracing Intellect and life complete. That means that it could not be one Intellect; it must be Intellect agglomerate including all the particular intellects, a thing therefore as multiple as all the Intellects and more so; and the life in it would nat be that of one soul but of all the souls with the further power of producing the single souls: it would be the entire living universe containing much besides man; for if it contained only man, man would be alone here. Enneads VI,7,8