"An exceptionally clear and readable introduction to the evolving psychology of the spirit, transpersonal psychology" from the renowned psychiatrist (Charles T. Tart, PhD, author of Mind Science). A turning point in psychology and human history . . . Loaded with case studies which present a unified model of human consciousness—a revolutionary map of the mind that explains our evolution, behavior, personality, and the mind-body connection—this work takes readers on a compelling journey into the mind, human behavior, and future of humankind. "If you want to know about the psychology of the future today, read this book. It is about a revolution in our understanding of the mind that is as far-reaching in psychology as the idea of the quantum was to physics." —Fred Alan Wolf, PhD, author of Taking the Quantum Leap "Grof marshals an impressive array of data and speculation in support of the timely demand that Western science acknowledge consciousness and its many non-ordinary states." —Ram Dass