The Ocean of Definitive Meaning by the Ninth Karmapa (1555-1603) is the most in-depth and famed text on Mahamudra ever written and is of vital importance in the living Kagyu tradition. It offers a detailed, uniquely comprehensive presentation of instructions on both the view and the practice. In the teachings contained in this book, Thrangu Rinpoche has distilled the essence of the Ninth Karmapa's massive text into manageable proportions and has given pointed guidance on the implementation of its instructions. According to Thrangu Rinpoche, Mahamudra practice is especially appropriate for Westerners and contemporary practitioners because it can be realized in the context of virtually any lifestyle. Mahamudra dissolves the artificial separation between phenomena and emptiness, revealing the radiant display of mind. The availability of the translation of this text has traditionally been restricted to advanced students. However, Khenchen Thrangu Rinpoche has kindly consented to the publication of these core teachings on the text, which were transcribed from a wonderful 2001 retreat he led in the mountains of British Columbia for one hundred and forty Western students. His compelling presentation provides teachers and students with a systematic approach to some of the highest practices in the Kagyu tradition. Thrangu Rinpoche's extraordinary wisdom and insight make this new commentary a peerless jewel in the canons of spiritual literature.