Tantra as a swift path to enlightenment

Vajrayana Buddhists affirm tantra as a swift and powerful vehicle to enlightenment, the "diamond" or "thunderbolt" way. Building on the Mahayana, it employs a distinctive repertoire of means: mantra, visualisation of deities (yidam) as embodiments of enlightened qualities, sacred diagrams (mandala), ritual gesture (mudra), and yogic disciplines, all transmitted through initiation and guided by a qualified teacher. The claim is that these methods, harnessing the very energies of body and mind, can accomplish in one lifetime what other paths take many lives to reach.

Tibetan doxography organises tantric texts into four classes of increasing intensity, Kriya, Charya, Yoga, and Anuttarayoga (highest yoga tantra), the last of which contains material describing transgressive elements, ritual use of substances otherwise forbidden and sexual symbolism among them, that Indian and Tibetan commentators have long debated how literally to read. Some lineages and periods have practised such elements literally under strict initiatory supervision, while most later Tibetan monastic scholasticism, especially the celibate Geluk tradition formalised by Tsongkhapa in the fourteenth and fifteenth centuries, reinterprets the highest tantras' transgressive imagery symbolically, as maps of internal psycho-physical processes rather than instructions for literal conduct.

Because its methods are held to be potent and easily misused, Vajrayana insists on empowerment (abhisheka) and close reliance on the guru or lama, giving the tradition its characteristic emphasis on transmission and lineage. The path does not reject the Mahayana goal of the bodhisattva who seeks awakening for the sake of all beings but claims to reach it more directly. Its affirmation of tantra as the supreme and swiftest vehicle distinguishes Vajrayana, dominant in Tibetan and Himalayan Buddhism and present in Japanese Shingon, from the Theravada and much of the wider Mahayana.

Vajrayana reached Tibet through several distinct transmission lineages. The Nyingma, oldest of the Tibetan schools, traces its tantras to Padmasambhava, the eighth-century tantric master traditionally credited, at the invitation of King Trisong Detsen, with subduing local spirits and establishing Buddhism at Samye monastery.

The later "new translation" schools, including the Kagyu, trace instead to eleventh-century translators such as Marpa, who studied in India under the tantric master Naropa and transmitted his teaching to the poet-yogi Milarepa, whose own hard-won realisation through solitary ascetic practice remains one of Tibetan Buddhism's most celebrated exemplars of the tantric path in action.