Written in India in the early eighteenth century AD, Santideva's Bodhicaryavatara became one of the most popular accounts of the Buddhist spiritual path. Important as a manual of training among Mahayana Buddhists, especially in the Tibetan Buddhist tradition, this text continues to be used as the basis for teaching by modern Buddhist teachers. This new translation from the original language provides detailed annotations explaining allusions and technical references. The Introductions set Santideva's work in context, and for the first time explain its structure.