Properly speaking, the unconscious is the real psychic; its inner nature is just as unknown to us as the reality of the external world, and it is just as imperfectly reported to us through the data of consciousness as is the external world through the indications of our sensory organs.

Psychoanalysis remains influential within psychiatry and across the humanities. His analysis of his own and his patients dreams as wish-fulfilments provided him with models for the clinical analysis of symptom formation and the mechanisms of repression as well as for further elaboration of his theory of the unconscious as an agency disruptive of conscious states of mind. Auden wrote in a poem dedicated to him: "to us he is no more a person / now but a whole climate of opinion / under whom we conduct our different lives".