Nor are we warranted in affirming a plurality of Intellectual Principles on the ground that there is one that knows and thinks and another knowing that it knows and thinks. For whatever distinction be possible in the Divine between its Intellectual Act and its Consciousness of that Act, still all must be one projection not unaware of its own operation: it would be absurd to imagine any such unconsciousness in the Authentic Intelligence; the knowing principle must be one and the selfsame with that which knows of the knowing. Enneads II,9,1
Now the reasoning faculty which undertakes this problem is not a unity but a thing of parts; it brings the bodily nature into the enquiry, borrowing its principles from the corporeal: thus it thinks of the Essential Existence as corporeal and as a thing of parts; it baulks at the unity because it does not start from the appropriate principles. We, however, must be careful to bring the appropriately convincing principles to the discussion of the Unity, of perfect Being: we must hold to the Intellectual principles which alone apply to the Intellectual Order and to Real Being. Enneads VI,5,2