As Buddha himself was passing away, he prophesied that Padmasambhava would be born not long after his death in order to spread the teaching of the Tantras. It was Padmasambhava who established Buddhism in Tibet in the eighth century. For us Tibetans, Padmasambhava, Guru Rinpoche, embodies a cosmic, timeless principle; he is the universal master.
I have always turned to Padmasambhava in times of difficulty and crisis, and his blessing and power have never failed me. When I think of him, all my masters are embodied in him. To me he is completely alive at all moments, and the whole universe, at each moment, shines with his beauty, strength, and presence.
~ Tibetan Book of Living and Dying by Sogyal Rinpoche, chapter 9