Also known as Guru Rinpoche. An Indian Master who along with Shantarakshita and King Trisong Detsen established Tantric Buddhism in Tibet (8th century). He is perhaps most known to westerners in relation to the so-called "Tibetan Book of the Dead." He is widely revered in Tibetan Buddhism, second only to the Buddha Shakyamuni.
"Tremendous is the effort and the vigilance that is needed from second to second, from moment to moment, in order to not fall into illusions. One minute of unawareness is enough for the mind to be already dreaming about something else, distracting it from the job or deed that we are living at the moment."