The Tibetan teaching of Dzog-chen (pronounced ZOAK-chen), also known as Ati yoga, is considered by its adherents to be the definitive and most secret teaching of the Buddha. Primordial Experience is a translation of a key text articulating the Dzog-chen teachings, "Gold Refined from Ore," by Mañjusrimitra, an Indian disciple of the first teacher of Ati yoga. According to the Dzog-chen teachings, purity of mind is always present and only needs to be recognized.