Tsongkhapa's A Lamp to Illuminate the Five Stages (1419) is a comprehensive presentation of the highest yoga class of Buddhist tantra, especially the key practices - the so-called five stages ( pancakrama ) - of the advanced phase of Guhyasamaja tantra. Beginning with a thorough examination of the Indian sources, Tsongkhapa draws particularly from the writings of Nagarjuna, Aryadeva, Candrakirti, and Naropa to develop a definitive understanding of...