This section is devoted to the fourth (and highest) of the four classes of the tantras: “Highest Yoga Tantra” (བླ་མེད་རྣལ་འབྱོར་རྒྱུད་, bla med rnal ’byor rgyud, anuttarayogatantra). Some of the most influential tantric texts are found here, including those from the Kālacakra, Cakrasaṃvara, and Hevajra traditions.
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