The tantric Buddhist tradition of the Lam 'bras, the "Path with the Result," has been practiced in Tibet for almost a thousand years, most prominently within the Sakya lineage. Luminous Lives is the first in-depth study of the literature and history of the Lam 'bras in Tibet. The central focus of the work is a rare Tibetan history that brings alive the story of the earliest men and women practitioners of the Lam 'bras. This text, recording the words of the great Sakya Pandita (1182 - 1251), was a major source for all later histories of the tradition. Recently rediscovered, it has been reproduced here along with Cyrus Stearns' excellent translation, introduction, and annotations. Luminous Lives opens a window into the world of one of the great traditions of tantric Buddhism in Tibet.