This book examines, above all, the relationship between reason and Vedic revelation, and the philosophical responses to the idea of the Veda. It deals with such topics as dharma, karma and rebirth, the role of man in the universe, the motivation and justification of human actions, the relationship between ritual norms and universal ethics, and reflections on the goals and sources of human knowledge. Halbfass presents previously unknown materials concerning the history of sectarian movements, including the notorious “Thags” (thaka), and relations between Indian and Iranian thought. The approach is partly philosophical and partly historical and philological; to a certain extent, it is also comparative. The author explores indigenous Indian reflections on the sources, the structure and the meaning of the Hindu tradition, and traditional philosophical responses to social and historical realities. He does not deal with social and historical realities per se; rather, basing his work on the premise that to understand these realities the reflections and constructions of traditional Indian theorists are no less significant than the observations and paradigms of modern Western historians and social scientists, he explores the self-understanding of such leading thinkers as Sankara, Kumarila, Bhartrhari and Udayana.