Book excerpt: Why Do I Do That? adapts the basic strategies of psychodynamic psychotherapy to a guided course in self-exploration, highlighting the universal role of defense mechanisms in warding off emotional pain. With easy-to-understand explanations, the first part teaches you about the unconscious mind and the role of psychological defenses in excluding difficult feelings from awareness. Individual chapters in the longer middle section explore the primary defense mechanisms one by one, with exercises to help you identify your own defenses at work. The final part offers guidance for how to "disarm" your defenses and cope more effectively with the unconscious feelings behind them. Psychological defense mechanisms are an inevitable and necessary part of the human experience; but when they become too pervasive or deeply entrenched, they may damage our personal relationships, restrict or distort our emotional lives and prevent us from behaving in ways that promote lasting self-esteem.