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The Vajrasattva practice acts to purify all past accumulation of negative karma. It is a confession practice which uses Four Powers to complete the purification:

1. The deity as the support
2. The feeling of regret
3. The method, which is the descent of the nectar
4. The vow to never again repeat these negative actions
   

~  Lama Tharchin Rinpoche
Ngondro Commentary
© 2000 by Bero Jeydren Publications

Thangka by Sergey Noskov