Knowledge rests not upon truth alone, but upon error also
All too easily does self-criticism poison one’s naivete, that priceless possession, or rather gift which no creative man can be without. At any rate, philosophical criticism has helped me to see that every psychology – my own included – has the character of a subjective confession. And yet I must prevent my critical powers from destroying my creativeness. I know well enough that every word I utter carries with it something of myself – of my special and unique self with its particular history and its own particular world. Even when I deal with empirical data, I am only necessarily speaking about myself. But it is only by accepting this as inevitable that I can serve the cause of man’s knowledge of man – the cause which Freud also wished to serve, and which, in spite of everything, he has served. Knowledge rests not upon truth alone, but upon error also.