In the riveting exploration that is "The Immortality Key," Brian C. Muraresku embarks on a decade-long investigation to uncover the psychedelic roots of Western civilization, challenging the foundations of Christianity and the broader narrative of spiritual experience. With the precision of a scholar and the narrative flair of a storyteller, Muraresku guides us through ancient ruins and sacred texts, from the mystical rites of Eleusis to the hallowed archives of the Vatican and the Louvre. This book promises to unravel a 2,000-year-old mystery, revealing the psychedelic sacrament that linked the ancient Greeks with the early Christians—a secret long suppressed by the powers of history. Muraresku not only questions what we know about the origins of Western religion but also invites us to reconsider the nature of spirituality itself. Drawing on a wealth of sources, including never-before-translated documents, archaeological evidence, and cutting-edge psychedelic research, "The Immortality Key" uncovers the lost connection between visionary substances and the quest for divine insight. This groundbreaking work sheds light on the sacramental use of psychoactive substances in the spiritual practices of our ancestors, offering a provocative and compelling argument that these ancient rituals shaped the very foundation of Western culture. Through this lens, Muraresku exposes the profound, transformative potential of these sacred practices, challenging modern perceptions of consciousness, faith, and the divine.