Plotinos: Complete Works, v. 2 In Chronological Order,...

31. If theory belong to imagination, and if both the rational and irrational souls possess memory, we will have two kinds of imagination (intellectual and sensual); and if both souls are separate, each of them will possess one kind of imagination. The theory of two kinds of imagination within us in the same principle would not account for there being two kinds of imagination; and it would leave unsolved the question to which of them memory belongs. If memory belong to both kinds of imagination, there will always be two kinds of imagination—for it cannot be said that the memory of intelligible things belongs to the one, and that of sense-things to the other; otherwise we would have two animate beings with nothing in common. If then memory equally belong to both imaginations, what difference is there between them? Besides, why do we not notice this difference? Here is the cause.