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The Vajrasattva Mantra in Dzogchen Practice

The Tibetan Vajrasattva Mantra is the 100 syllable mantra of purification transmitted to us through Jigme Lingpa's Longchen Nyingthig hybrid Sanskrit-Tibetan diglossia. I here offer a very brief explanation from the Fruitional View of acausal nondual Ati Dzogchen. 

In Dzogchen the Vajrasattva Mantra is 'transformed' from a relative plea for  'purification of obscurations' into ultimate direct Dzogchen kadag Primordial Purity itself. The Mantra 'points out' the already present peace and purity of Nature of Mind (sem nyi).

'Purification' is now: immediate self-liberation (rang drol) of conceptual 'defilements' at the instant of their arising from never defiled stainless primordial Ground of Being (rang rig yeshe). Sambhogakaya Buddha Vajrasattva is—in the view of Ultimate Truth—our 'already present and accomplished' knowing/feeling rigpa Presence of pristine Primordial Awareness dharmakaya 'groundless' Ground of Being. That present boundless unbroken rigpa is Vajrasattva's samaya to us. That promise is already kept in this timeless moment now. The purity and forgiveness we desire is "already present and accomplished from the very beginning" (Nagarjuna). Bright, luminous (salba), innermost 'active' rigpa Presence of That: tathata, sattva, suchness, quidditas, chönyi, metanoia. It can never be lost or destroyed. 

Yes. Vajrasattva is essential rigpa—indestructible purity of Primordial Awareness Ground itself. Purification is recognition/realization of indwelling rigpa Presence of this ever present Ground. Therefore: "Samaya is rigpa; I promise to remain here; Vajrasattva is always present compassionate purity of my mind; I surrender grasping desire in kadag Ground manifesting as lhundrub Presence of self-aware HUM; Energy display of Mind Nature; Hoh, Vajra of all buddhas; Basic space Being Ground that I am. AH HUM PHAT!"

The Vajrasattva Mantra
The Great Indo-Tibetan 100 Syllable Mantra of Purification

                                                                                                         Om Vajra (Benza) Sattva Samaya
                                                                                    Manu Palaya 
                                                                                    Vajra Sattva Tenopa
                                                                                    Tishtho Drdho Me Bhava
                                                                                    Suto Khayo Me Bhava
                                                                                    Supo Khyo Me Bhava
                                                                                    Anurakto Me Bhava
                                                                                    Sarva Siddhi Me Trayatza
                                                                                    Sarva Karma Sutsa Me
                                                                                    Chittam Shri Yam Kuru Hum
                                                                                    Ha Ha Ha Ha Ho
                                                                                   Bhagavan Sarva Tathagata
                                                                                   Vajra Ma Me Muntsa
                                                                                   Vajra Bhava Mahasamaya Sattva
                                                                                   AH HUM PHET!
                                                                                 (Recite 21 or 100 times)

Brief Version
OM BENZA SATTO HUNG (HUM)