Anyone who has any ego-consciousness at all takes it for granted that he knows himself. But the ego knows only its own contents, not the unconscious and its contents. People measure their self-knowledge by what the average person in their social environment knows of himself, but not by the real psychic facts which are for the most part hidden from them. In this respect the psyche behaves like the body, of whose physiological and anatomical structure the average person knows very little too. ["The Undiscovered Self," CW 10, par. 491.]
— Jung