"Burckhardt ... says that Hitler has a dual personality, the first being that of the rather gentle artist, and the second that of the homicidal maniac. He is convinced that Hitler has no complete confidence in himself and that his actions are really governed by somnambulist certainty. He says that the main energy in Hitler is an energy of hatred, and that he has never met any human being capable of generating so terrific a condensation of envy, vituperation and malice."
January 1, 1970
https://en.wikiquote.org/wiki/Adolf_Hitler