Khetsun Sangpo Rinpoche provides an expansive and illuminating commentary on the great Nyingma scholar-yogi Mipam Gyatso's incisive work on the Great Completeness view of ultimate reality, called "Three Cycles on Fundamental Mind". Beginning with a biography of Mipam, Khetsun Sangpo Rinpoche explains the aim of this book - the differentiation of mistaken mind and fundamental mind. The main theme is primordial enlightenment in the basic clear light, self-arisen pristine wisdom. Then in four chapters Mipam presents the basic mind, or vajra matrix, drawing on myriad explanations in tantras; details how fundamental mind is an uncompounded union of luminosity and emptiness; refutes Jawa Do-ngak's presentation of the Great Completeness as a compounded mind; and draws distinctions about the nature and appearance of fundamental mind prior to and after realization. The emphasis is on being introduced to and identifying fundamental mind in naked experience through a lama's quintessential instructions.