Here Sangharakshita orientates us to Vajrasattva, the primordial Buddha of Innate Purity. He introduces the Vajrasattva practice as part of the four indispensable preparatory practices (mula-yogas) of the Vajrayana devotee.
From the talk entitled The Four Foundation Yogas of the Tibetan Buddhist Tantra, part of the series An Introduction to Tibetan Buddhism, 1968.
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