This work investigates the esoteric practices of Tibetan yoga and the underlying philosophical doctrines that govern these meditative disciplines. W.Y. Evans-Wentz, a scholar of comparative religion, compiles and translates rare texts to bridge the gap between Eastern mystical traditions and Western academic understanding. The book argues that these practices are not merely physical exercises but are deeply rooted in a complex psychological and spiritual framework designed to achieve enlightenment.

Scholars and practitioners often cite this text as a foundational, albeit dense, introduction to Tibetan esoteric traditions. Readers frequently note that the prose requires significant patience due to the complexity of the subject matter and the archaic nature of the translated source material.