It has been supposed by many that he lived to a great age, and argued that "the never-to-be-mistaken fundamental tone of his performance is the quiet talkativeness of a highly cultivated, tolerant, intelligent, old man" (Dahlmann).
He was, unlike Napoleon, "thoroughly French in character, possessing all the liveliness and talkativeness of that people."
Manic episodes are characterized by feelings of euphoria, lack of inhibitions, racing thoughts, diminished need for sleep, talkativeness, risk taking, and irritability.
