The muscular person likes to use his muscles, indeed, has to use them in order to self-actualize, and to achieve the subjective feeling of harmonious, uninhibited, satisfying functioning which is so important an aspect of psychological health. People with intelligence must use their intelligence, people with eyes must use their eyes, people with the capacity to love have the impulse to love and the need to love in order to feel healthy. Capacities clamor to be used, and cease their clamor only when they are used sufficiently.