“Psychoanalysis itself and the lines of thought to which it gives rise,” said C. G. Jung, “are only a beginner’s attempt compared to what is an immemorial art in the East”—by which he was referring to the millennia-old study of the mind found in Yoga. That tradition was hardly known in the West when the discipline of psychology arose in the nineteenth century, but with the passing of time the common ground between Yoga and psychology has become ever more apparent. Georg Feuerstein here uses a modern psychological perspective to explore the ways Hindu, Buddhist, and Jaina yogas have traditionally regarded the mind and how it works—and shows how that understanding can enhance modern psychology in both theory and practice.