The 1972 "Flesh of the Gods" by Peter Furst delves into the occult and shamanic practices involving the use of psychedelic mushrooms as a means of accessing sacred wisdom. This book explores the spiritual significance of these substances in ancient cultures and how they were used for rituals and divination. Furst provides a unique perspective on the intersection of religion, spirituality, and the use of entheogens in seeking spiritual enlightenment and connection to the divine.