“Self-esteem is not a value that, once achieved, is maintained automatically thereafter; like every other human value, including life itself, it can be maintained only by action. Self-esteem, the basic conviction that one is competent to live, can be maintained only so long as one is engaged in a process of growth, only so long as one is committed to the task of increasing one's efficacy. In living entities, nature does not permit stillness: when one ceases to grow, one proceeds to disintegrate--in the mental no less than in the physical.”