Ruck charts a ping-pong battle between the Vatican and its sworn enemies. He notes “periods of suppression,” followed by revivals of “renewed heresies, no doubt neo-pagan continuations of Classical rites” that culminated in the “cults of witchcraft” during the Middle Ages and Renaissance. Long disregarded by the classicists and theologians, Ruck has tried to convince his colleagues that drugs are integral to the history of Christianity.