Grauer explains how individuals--and by extension societies--benefit from safely accessing transcendent states of consciousness, such as those provided by psychedelics. He explores how psychoactive substances have been used throughout history all over the world for healing, personal growth, spiritual development, and revealing hidden truths, such as in the Eleusinian Mysteries, Soma practices in Vedic India, and rituals in several South American indigenous cultures. Drawing on the plant intelligence work of Paul Stamets and Stephen Buhner, Grauer shows that the growth of individual and collective intelligence is hindered by the prohibition of psychedelics, which naturally foster humanity’s capacity for analysis, innovation, and cooperation. In addition to creating a sense of unity with all things, psychedelics offer the mind a new perspective from which to analyze its experience and heighten its awareness.