For more than fifty years we have known, or could have known that there is an unconscious counterbalance to consciousness. Medical psychology has furnished all the necessary empirical and experimental proofs of this. There is an unconscious psychic reality which demonstrably influences consciousness and its contents. All this is known, but no practical conclusions have been drawn from this fact. We still go on thinking and acting as before, as if we were simplex and not duplex. Accordingly, we imagine ourselves to be innocuous, reasonable, and humane. We do not think of distrusting our motives or of asking how the inner man feels about the things we do in the outside world. But actually it is frivolous, superficial, and unreasonable of us, as well as physically unhygienic, to overlook the reaction and standpoint of the unconscious.
- Pg. 46, The Undiscovered Self – C.G. Jung, 9-780691-150512