A classic collection of writings on the meditation practice and theory of Dzogchen, the Great Perfection, by the celebrated fourteenth-century scholar and adept Longchen Rabjam (Longchenpa). This classic collection of texts on the meditation practice and theory of Dzogchen presents the Great Perfection through the writings of its supreme authority, the fourteenth-century Tibetan scholar and visionary Longchen Rabjam. The pinnacle of Vajrayana practice in the Nyingma tradition of Tibetan Buddhism, Dzogchen embodies a system of training that awakens the intrinsic nature of the mind to reveal its original essence, utterly perfect and free from all duality--buddha nature, or buddhahood itself. In The Practice of Dzogchen, Tulku Thondup translates essential passages from Longchen Rabjam's voluminous writings to illuminate and clarify this teaching. He also draws on the works of later masters of the tradition, placing Dzogchen in context both in relation to other schools of Buddhism and in