First published in English in 1980, Stanislav Grof’s classic text, with a new foreword by Albert Hofmann (2008), explores the therapeutic and spiritual potential of LSD. Drawing on decades of clinical research, Grof presents case studies and theoretical frameworks that reveal how psychedelic therapy can aid trauma resolution, personal transformation, and spiritual awakening. The book remains a foundational resource for understanding consciousness and the role of psychedelics in psychotherapy.