This book focuses on Don Browning's rich investigative journey into Freud's dual instinct model, the relationship between human biology and culture, evolutionary psychology, William James's instinctual pluralism, Erik Erikson's notion of generativity, the ethical implications of self-actualization in the humanistic psychologies of Rogers and Maslow, evil and self-realization in Carl Jung, the place of self-injury in the thought of Heinz Kohut, and other issues.