In The Heart of Man, renowned humanist philosopher and psychoanalyst Erich Fromm investigates man's capacity to destroy, his narcissism, and his incestuous fixation. He expands upon ideas he presented in Escape from Freedom, Man for Himself, and The Art of Loving, and examines the essence of evil, as well as the choice between good and evil. He also explores man's ability to destroy and further considers freedom, aggression, destructiveness, and violence.