ボン敎における佛敎二諦思想の受容とその展開

Abstract

The Bon religion had existed in Tibet before the arrival of Buddhism, and it later absorbed Buddhist doctrine and created its own doctrine. The following questions need to be answered : (1) how were Buddhist doctrines adopted by the Bonpos? (2) which part of this doctrine comes from Buddhist theories ? (3) which parts are unique theories of the Bonpos? This paper analyzes the process of the absorption of the Buddhist theory, especially focusing on the two truths : the absolute truth and the conventional truth. This paper presents two types of Bonpo scripture : one gives the theory of two truths of the Svātantrika-mādhyamika school and the other gives that of the Prāsa gikamādhyamika school. Because this classification of Svātantrika and Prāsa gika developed in Tibet (rather than in India), it would seem that Bonpos took most of their theory of the two truths from Tibetan Buddhism, rather than from Indian Buddhism. However Bonpos seem to have referred not only to Tibetan Buddhist scriptures but also to Indian Buddhist ones, because they cite some passages directly from Indian Buddhist texts. On the other hand, the remarkably detailed subdivisions of the two truths are found in neither Indian nor Tibetan Buddhist scriptures. In this respect, Bonpos also seem to have developed their own original ideas.