MacKenna-Plotinus: thinking principle

As a beginning, what is the origin of the Ideas in general? It is not that the thinking principle thought of each Idea and by that act of thought procured their several existences; not because Justice and Movement were thus thought did they come to be; that would imply that while the thought is later than the thing – the concept of Justice must be later than Justice itself – yet the thought precedes what, as founded on the thinking, owes its existence to it. Besides, if justice is only a certain definite thought we have the absurdity that Justice is nothing more than a definition of Justice. Thinking of Justice or Movement is but grasping their nature; this would mean grasping the non-existent, an impossibility. Enneads   VI,6,

Again, if the Supreme is to have intellection it cannot know only itself; that would not be intellection, for, if it did know itself, nothing could prevent it knowing all things; but this is impossible. With self-intellection it would no longer be simplex; any intellection, even in the Supreme, must be aware of something distinct; as we have been saying, the inability to see the self as external is the negation of intellection. That act requires a manifold-agent, object, movement and all the other conditions of a thinking principle. Further we must remember what has been indicated elsewhere that, since every intellectual act in order to be what it must be requires variety, every movement simple and the same throughout, though it may comport some form of contact, is devoid of the intellective. Enneads VI,7,