We act in accordance with our self-image. This self-image—which, in turn, governs our every act—is conditioned in varying degree by three factors: heritage, education, and self-education. The part that is inherited is the most immutable. The biological endowment of the individual—the form and capacity of his nervous system, his bone structure, muscles, tissue, glands, skin, senses—are all determined by his physical heritage long before he has any established identity. His self-image develops from his actions and reactions in the normal course of experience
