Tsongkhapa's commentary entitled A Book of Three Inspirations: A Treatise on the Stages of Training in the Profound Path of Naro's Six Dharmas is commonly referred to as The Three Inspirations. Anyone who has read more than a few books on Tibetan Buddhism will have encountered references to the Six Yogas of Naropa, a preeminent yogic technology system. The six practices--inner heat, illusory body, clear light, consciousness transference, forceful projection, and bardo yoga--gradually came to pervade thousands of monasteries, nunneries, and hermitages throughout Central Asia over the past five and a half centuries.