The tradition known as the Path with the Result, or "Lamdre," is the most important tantric system of meditation practice and theory in the Sakya school of Tibetan Buddhism. This volume contains an unprecedented compilation of eleven vital works from different periods in the history of the Path with the Result in India and Tibet, including the "Vajra Lines" of the great Indian adept Virupa (ca. seventh-eighth centuries), the basic text of the tradition. The collection also includes six writings by Jamyang Khyentse Wangchuk (1524-68) and an instruction manual composed by the Fifth Dalai Lama (1617-62). None of the works in this book have ever been published before in any European language, and most of these writings traditionally have been considered secret. The present translation, an important new volume of the "Library of Tibetan Classics," has been made with the personal approval and encouragement of His Holiness Sakya Trizin, head of the Sakya tradition. Students of the Lamdre will rejoice at the availability and lucidity of this major translation of key Sakya texts.