Book excerpt: Drawing on modern research in psychology and psychiatry, as well as the world's great contemplative traditions, this classic presents a model of individual development that embraces both the conventional stages of psychological growth and the higher levels of spiritual development. In nine seminal essays, the authors and three contributors present discussions on the following topics: A full-spectrum model of consciousness, focusing on the self and its journey through the basic structures of matter, body, mind, soul, and spirit Types of psychopathology that emerge at the various levels of spiritual development Misuses and psychiatric complications of meditation practice Pioneering research into the cross-cultural stages of the meditative path A new preface by Ken Wilber, placing this work within his current integral model of consciousness Contributors include the psychiatrist Mark Epstein (author ofThoughts without a Thinkerand several other books on Buddhism and psychology), and the Christian theologian John Chirban.