"Collectively, these essays constitute the best single inquiry into the religious significance of chemically occasioned mystical experience that has yet appeared."
-- Huston Smith, PhD., author of The World's Religions and One Nation Under God

"This book provides a balanced, thoroughly researched and clear account about a topic that has fascinated people for centuries -- even millennia -- and will be with us, one way or another, for a long time to come."
-- Harvey Cox, Ph.D., L.H.D., Professor of Divinity, Harvard University

"An important book for anyone who cares about the future of the human race. The sensible use of entheogens is one of the most promising paths to deep spiritual insight for many people, and this book shows how that can be done -- if we care enough."
-- Charles T. Tart, Ph.D., Professor Emeritus of Psychology, University of California, author of Altered States of Consciousness

"We have long needed this well-articulated, thoughtful, and rational basis for understanding the power of psychedelic biochemicals to stimulate visionary experience. These essays make a strong case for the use of these substances in future religious practice."
-- Frank Barron, Ph.D., Sc.D., author of No Rootless Flower : An Ecology of Creativity

"If you want more than emotional and subjective outpourings about entheogens, and if you think like I do that unless we expand our awareness we will not have a happy future, then this is the book to read."
-- Rabbi Zalman M. Schachter-Shalomi, author of From Age-ing To Sage-ing

"Essential readings for everyone concerned with spiritual, psychological, and social well-being. A fascinating and significant collection."
-- Frances Vaughan, Ph.D., author of Shadows of the Sacred and The Inward Arc

"Offers a thoughtful, sane examination of a topic of great social, psychological, and religious significance."
-- Roger Walsh, M.D., Ph.D., Professor of Psychiatry, University of California