This book, the first in a series by the internationally-known and scholar Lee Thayer, addresses the centrality of relevance in people’s health and lives. It is not about what is relevant to us, but to whom or to what we are relevant. Loss of relevance leads to the degeneration of mental and then physical health. Those who do not feel relevant to their world are the people who do violence to other people, or to themselves. How and why this feeling of relevance to others and to the world affects our lives, and thus the lives of others, is thoroughly explored and documented. The concept of relevance should be the most basic concept in theory of psychology, sociology, anthropology and the therapeutic industries.