The root text is a teaching in verse written in the nineteenth century by Patrul Rinpoche, one of the outstanding teachers of his day. In the accompanying commentary, Dilgo Khyentse Rinpoche (1910-1991)--lineage holder of the Nyingma school and one of the great expounders of the Dharma in Europe and North America--expands upon the text with his characteristic compassion and uncompromising thoroughness. Patrul Rinpoche's fresh and piercing verses combined with Khyentse Rinpoche's down-to-earth comments offer a concise yet complete examination of the Buddhist path.