Phases:

A best-seller since it was fast published, Phases describes each period of life -- adolescence, the twenties, thirties, forties, etc. -- and looks at the inner qualities and challenges that arise at each stage. The author argues that typical biological and psychological explanations of the human being are often incomplete. If the inner self, the ego, of each individual is recognized and acknowledged, then the peculiarities of one's particular life-path and its challenges take on new meaning.