31. But if each of the two phases of the soul, as we have said, possesses memory, and memory is vested in the imaging faculty, there must be two such faculties. Now that is all very well as long as the two souls stand apart; but, when they are at one in us, what becomes of the two faculties, and in which of them is the imaging faculty vested?
If each soul has its own imaging faculty the images must in all cases be duplicated, since we cannot think that one faculty deals only with intellectual objects, and the other with objects of sense, a distinction which inevitably implies the co-existence in man of two life-principles utterly unrelated.
And if both orders of image act upon both orders of soul, what difference is there in the souls; and how does the fact escape our knowledge?
The answer is that, when the two souls chime each with each, the two imaging faculties no longer stand apart; the union is dominated by the more powerful of the faculties of the soul, and thus the image perceived is as one: the less powerful is like a shadow attending upon the dominant, like a minor light merging into a greater: when they are in conflict, in discord, the minor is distinctly apart, a self-standing thing- though its isolation is not perceived, for the simple reason that the separate being of the two souls escapes observation.
The two have run into a unity in which, yet, one is the loftier: this loftier knows all; when it breaks from the union, it retains some of the experiences of its companion, but dismisses others; thus we accept the talk of our less valued associates, but, on a change of company, we remember little from the first set and more from those in whom we recognize a higher quality.