This is the simplest and least pretentious account of the discipline of Yoga ever published anywhere. Crowley studied Yoga in the East, with true masters; and he managed to transmit it in language intelligible to Western minds. The approach is rigorously skeptical and scientific: no claims are made or allowed that cannot be verified by experiment. Mr. MottaÕs notes aim chiefly at explaining how the peculiar psychological states produced by the practice of Mysticism may lead the mystic of whatever sect either to great wisdom, personal fulfillment and social usefulness or to spiritual insanity and religious persecution of people of other faiths.