The Great Perfection, also known as the Atiyoga or Dzogchen (rDzogs chen), is a tradition of esoteric Buddhism that was first transmitted from India to Tibet in the Eighth Century of the Common Era. The Tantras translated in this volume were among the earliest translations into Tibetan, and are preserved in the manuscript collections known as the Hundred Thousand Tantras of the Ancients (rNying ma rgyud 'bum) and the Hundred Thousand Tantras of Vairochana...