The Nyingma school of Tibetan Buddhism traces its origin to the Indian adept, Guru Padmasambhava, who came to Tibet in 817 C.E. at the invitation of King Trisong Deutsan (742-797) in order to subdue the evil forces then impeding the spread of Buddhism. Guru Rinpochey, as he is popularly known, bound all evil spirits by oath and transformed them into forces compa...