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.