Book excerpt: Samuel identifies the two main orientations of this religion as clerical (primarily monastic) and shamanic (associated with Tantric yoga). The specific form that Buddhism has taken in Tibet is rooted in the pursuit of enlightenment by a minority of the people - lamas, monks, and yogins - and the desire for shamanic services (in quest of health, long life, and prosperity) by the majority. Shamanic traditions of achieving altered states of consciousness have been incorporated into Tantric Buddhism, which aims to communicate with Tantric deities through yoga. The author contends that this incorporation forms the basis for much of the Tibetan lamas' role in their society and that their subtle scholarship reflects the many ways in which they have reconciled the shamanic and clerical orientations. This book, the first full account of Tibetan Buddhism in two decades, ranges as no other study has over several disciplines and languages, incorporating historical and anthropological discussion.