Reveals entheogens as catalysts for spiritual development and direct encounters with the sacred - With contributions by Albert Hofmann, Huston Smith, Stanislav Grof, Charles Tart, Alexander "Sasha" Shulgin, Frances Vaughan, and many others - Includes personal accounts of Walter Pahnke's Good Friday Experiment as well as a 25-year follow-up with its participants - Explores protocols for ceremonial use of psychedelics and the challenges of transforming...