Vajrasattva (Tibetan: Dorje Sempa )
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Vajrasattva is the sovereign lord of all the mandalas of the Vajrayana, or Diamond Vehicle. To meditate on Vajrasattva is the same as to meditate upon all the Buddhas. His hundred-syllable mantra is the quintessence of all mantras. The main obstacles to progress along the path to enlightenment are the obscurations that come from our past negative actions. There are various kinds of negative actions. Some, like killing, stealing, lying or cheating are obviously intrinsically unvirtuous. Others are transgressions of vows and precepts that the Buddha or one's teachers have taught to help one progress spiritually.