In this new book, Khenchen Thrangu provides an exhaustive commentary on the longest and most comprehensive of the three classic treatises on Mahamudra composed by the sixteenth-century scholar Wangchuk Dorje, the Ninth Karmapa. Khenchen Thrangu's teachings encompass the entire path of Mahamudra, including the preliminaries, the main practice, removing obstacles, and attaining the result of buddhahood—with detailed instruction in tranquility and insight meditation. This is the only available volume that presents Khenchen Thrangu's detailed commentary on this entire text.