It has often been noted that three major revolutions in thought have threatened the idea of human centrality. First, Copernicus demonstrated that Earth was not the center about which all celestial bodies revolved. Next, Darwin showed us that we were not central in the chain of life but, like all other creatures, had evolved from other life-forms. Third, Freud demonstrated that we are not masters in our own house-that much of our behavior is governed by forced outside of our consciousness. There is no doubt that Freud's unacknowledged co-revolutionary was Arthur Schopenhauer, who, long before Freud's birth, had posited that we are governed by deep biological forced and then delude ourselves into thinking that we consciously choose our activities.