He was a man possessed by a daemon — a man who had been vouchsafed an overwhelming revelation that took possession of his soul and never let him go.
Jung offers his most concentrated biographical-psychological portrait of Freud, framing his intellectual passion as daemonic possession rather than rational inquiry, thereby interpreting Freud through the very depth-psychological categories Freud himself resisted.
, The Spirit in Man, Art, and Literature, 1966thesis