What a Canon of Commentary Preserves

The Tengyur took shape alongside the Kangyur in the same fourteenth century sorting project led by Buton Rinchen Drub, and the two were printed together at the same major monastic presses, Derge and Narthang among them, as companion halves of one canon. Its importance to modern scholarship goes beyond Tibetan Buddhism itself: the original Sanskrit texts behind many Tengyur works are lost entirely, destroyed or simply not copied forward through the centuries that followed the decline of Buddhist institutions in India, which means the Tibetan translation preserved in the Tengyur is sometimes the only surviving witness to what an Indian philosopher such as Dharmakirti actually argued.

Reconstructing lost strands of Indian Buddhist philosophy today depends in real, ongoing cases on working back from the Tengyur's Tibetan wording, making the collection a working research archive for historians of Indian thought as much as a canon read for its own tradition's religious purposes. That dependence runs in both directions: Tibetan scholars themselves have long used the Tengyur's preserved commentarial tradition to interpret the more compressed and difficult passages of the Kangyur's own sutras and tantras, treating the two collections as a single working reference library rather than as fully separable canons.