Psychedelics have been a part—often a central and sacred part—of most societies throughout history, and for half a century psychedelics have rumbled through the Western world, seeding a subculture, titillating the media, fascinating youth, terrifying parents, enraging politicians, and intriguing researchers. Not surprisingly, these curious chemicals fascinated some of the foremost thinkers of the twentieth century, fourteen of whom were interviewed for this book. Because no further human research can be done, these researchers constitute an irreplaceable resource. Higher Wisdom offers their fascinating anecdotes, invaluable knowledge, and hard-won wisdom—the culmination of fifty years of research and reflection on one of the most intriguing and challenging topics of our time.