Vajrayāna (), otherwise known as Mantrayāna ("Mantra Vehicle"), Guhyamantrayāna ("Secret Mantra Vehicle"), Tantrayāna ("Tantra Vehicle"), Indo-Tibetan Buddhism, Tantric Buddhism, and Esoteric Buddhism, is a vehicle of the Mahāyāna Buddhist tradition that emphasizes esoteric practices and rituals aimed at rapid spiritual awakening. Emerging between the 5th and 7th centuries CE in medieval India. Vajrayāna Buddhism incorporates a range of techniques, including the use of mantras (sacred sounds), dhāraṇīs (mnemonic codes), mudrās (symbolic hand gestures), mandalās (spiritual diagrams), and the visualization of deities and Buddhas. These practices are designed to transform ordinary experiences into spiritual paths toward enlightenment and liberation, often by engaging with aspects of desire and aversion in a ritualized context.
A distinctive feature of Vajrayāna Buddhism is its emphasis on esoteric transmission, where teachings are passed directly from teacher (guru or vajrācārya) to student through initiation ceremonies. Tradition asserts that these teachings have been passed down through an unbroken lineage going back to the historical Buddha (), sometimes via other Buddhas or bodhisattvas (e.g., Vajrapani). This lineage-based transmission ensures the preservation of the purity and effectiveness of the teachings. Practitioners often engage in deity yoga, a meditative practice where one visualizes oneself as a deity embodying enlightened qualities to transform one's perception of reality. The tradition also acknowledges the role of feminine energy, venerating female Buddhas and ḍākiṇīs (spiritual beings), and sometimes incorporates practices that challenge conventional norms to transcend dualistic thinking.
Vajrayāna has given rise to various sub-traditions across Asia. In Tibet, it evolved into Tibetan Buddhism, which became the dominant spiritual tradition, integrating local beliefs and practices. In Japan, it influenced Shingon Buddhism, established by Kūkai, emphasizing the use of mantras and rituals. Chinese Esoteric Buddhism also emerged, blending Vajrayāna practices with existing Chinese Buddhist traditions, however this is no longer a separate sect and has mostly mixed in with normal exoteric Buddhism. Each of these traditions adapted Vajrayāna principles to its cultural context while maintaining core esoteric practices aimed at achieving enlightenment.
Central to Vajrayāna symbolism is the vajra, a ritual implement representing indestructibility and irresistible force, embodying the union of transcendental wisdom and compassion. Practitioners often use the vajra in conjunction with a bell during rituals, symbolizing the integration of male and female principles. The tradition also employs rich visual imagery, including mudrās, complex mandalās, and depictions of wrathful deities that serve as meditation aids to help practitioners internalize spiritual concepts and confront inner obstacles on the path to enlightenment.
Terminology
thumb|A [[vajra and bell (ghanta), which are classic ritual symbols of Vajrayāna Buddhism]]
In medieval India, the initial terms that were used to refer to the tantric Buddhist tradition were Mantranāya ("Path of Mantras") and Mantrayāna ("Mantra Vehicle"). Later, other terms were adopted, like Vajrayāna ("Diamond Vehicle" or "Thunderbolt Vehicle").
In Tibetan Buddhism practiced in the Himalayan regions of India, Nepal, Tibet, and Bhutan, Buddhist Tantra is most often termed Vajrayāna (Tib. རྡོ་རྗེ་ཐེག་པ་, dorje tekpa, Wyl. rdo rje theg pa) and Secret mantra (Skt. Guhyamantra, Tib. གསང་སྔགས་, sang ngak, Wyl. gsang sngags). The vajra is a mythical weapon associated with Indra that was said to be indestructible and unbreakable (like a diamond) and extremely powerful (like a thunderbolt). Thus, the term is variously translated as Diamond Vehicle, Thunderbolt Vehicle, Indestructible Vehicle, and so on.
<blockquote>The vajra, or diamond, is an adamantine symbol. A diamond has two qualities: it has the power to shatter all ordinary stones, and conversely, no stone can break a diamond. The actual vajra is the mind that has the realization of the ultimate truth inseparably merged with a special kind of tantric bliss. [...] That is why the vajra, or diamond, is the symbol of the tantric path and its result: the wisdom of nondual emptiness and bliss.</blockquote>
In Chinese Esoteric Buddhism, it is generally known by terms such as Zhēnyán (Chinese: 真言, literally "true word", referring to mantra), Tángmì or Hanmì (唐密 - 漢密, "Tang Esotericism" or "Han Esotericism"), Mìzōng (密宗, "Esoteric Sect"), or Mìjiao (Chinese: 密教; Esoteric Teaching). The Chinese term mì 密 ("secret, esoteric") is a translation of the Sanskrit term Guhya ("secret, hidden, profound, abstruse").
In Japan, Buddhist esotericism is known as or by the term Shingon (a Japanese rendering of Zhēnyán), which also refers to a specific school of .
The term "Esoteric Buddhism" is first used by Western occultist writers, such as Helena Blavatsky and Alfred Percy Sinnett, to describe theosophical doctrines passed down from "supposedly initiated Buddhist masters."
Origins
According to David B. Gray, Vajrayana originated from pre-existing Tantric traditions, also known as 'Tantrism', which emerged within Hinduism during the first millennium CE. These early Hindu tantric practices had a profound influence on South Asian Mahāyāna Buddhism, leading to the development of distinct Buddhist tantric traditions, which arose in the 7th century CE, rapidly spread across Southeast, East, and Central Asia, giving rise to distinct traditions in East Asia and Tibet.
History
thumb|upright|Mahasiddhas, Palpung monastery. Note the figure of the great adept Putalipa at center, seated in a cave and gazing at an image of the meditational deity Samvara and the figure at the bottom left holding a skull-staff ([[khaṭvāṅga) and a flaying knife (kartika).]]
Mahasiddhas and the tantric movement
Tantric Buddhism is associated with groups of wandering yogis called mahasiddhas in medieval India. According to Robert Thurman, these tantric figures thrived during the latter half of the first millennium CE. According to John Myrdhin Reynolds, the mahasiddhas date to the medieval period in North India and used methods radically different from those used in Buddhist monasteries, including practicing on charnel grounds.
Since Tantra focuses on the transformation of poisons into wisdom, the yogic circles came together in tantric feasts, often in sacred sites (pitha) and places (ksetra), which included dancing, singing, consort practices, and the ingestion of taboo substances like alcohol, urine, and meat. At least two of the mahasiddhas cited in the Buddhist literature are comparable with the Shaiva Nath saints (Gorakshanath and Matsyendranath) who practiced Hatha Yoga.
According to Schumann, a movement called Sahaja-siddhi developed in the 8th century in Bengal. It was dominated by long-haired, wandering mahasiddhas who openly challenged and ridiculed the Buddhist establishment. The mahasiddhas pursued siddhis, magical powers such as flight and extrasensory perception as well as spiritual liberation.
Tantras
thumb|upright|[[Vajra Realm Mandala, based on the tantric Vajrasekhara Sutra, and symbolizing the final realization of Vairocana Buddha in Shingon]]
thumb|upright|Naked tantrikas dancing and eating from skull cups ([[kapalas), closeup of a Chakrasamvara mandala]]
Mahāyāna sutras contain "proto-tantric" material, such as the Gandavyuha and the Dasabhumika, which might have served as a central source of visual imagery for Tantric texts. Later Mahāyāna texts like the Kāraṇḍavyūha Sūtra (–5th century CE) expound the use of mantras such as Om mani padme hum, associated with vastly powerful beings like Avalokiteshvara. The Heart Sutra also includes a mantra.
Vajrayāna Buddhists developed a large corpus of texts, the Buddhist Tantras, some of which can be traced to at least the 7th century CE but might be older. The dating of the tantras is "a difficult, indeed an impossible task", according to David Snellgrove.
Some of the earliest of these texts, Kriya tantras such as the Mañjuśrī-mūla-kalpa (), teach the use of mantras and dharanis for mostly worldly ends, including curing illness, controlling the weather and generating wealth. The Tattvasaṃgraha Tantra (Compendium of Principles), classed as a "Yoga tantra", is one of the first Buddhist tantras that focuses on liberation as opposed to worldly goals. In another early tantra, the Vajrasekhara (Vajra Peak), the influential schema of the five Buddha families is developed. Other early tantras include the Mahāvairocana Abhisaṃbodhi and the Guhyasamāja (Gathering of Secrets).
The Guhyasamāja is a Mahayoga class of Tantra, which features forms of ritual practice considered "left-hand" (vamachara), such as use of taboo substances like alcohol, consort practices, and charnel ground practices that evoke wrathful deities. Ryujun Tajima divides the tantras into those that were "a development of Mahāyānist thought" and those "formed in a rather popular mould toward the end of the eighth century and declining into the esoterism of the left". This "left esoterism" mainly refers to the Yogini tantras and later works associated with wandering yogis. This practice survives in Tibetan Buddhism, but it is rare for this to be done with an actual person. It is more common for a yogi or yogini to use an imagined consort (a buddhist tantric deity, i.e. a yidam).
Later tantras such as the Hevajra Tantra and the Chakrasamvara are classed as "Yogini tantras" and represent the final form of development of Indian Buddhist tantras in the ninth and tenth centuries. This view is outlined in the following passage from the Hevajra tantra:
<blockquote>Those things by which evil men are bound, others turn into means and gain thereby release from the bonds of existence. By passion the world is bound, by passion too it is released, but by heretical Buddhists this practice of reversals is not known.</blockquote>
The Hevajra further states that "one knowing the nature of poison may dispel poison with poison."
Esler points out that while secrecy is presented as necessary to prevent the teachings from falling into the hands of unworthy recipients, it also serves to demarcate a kind of religious in-group. He observes that from an anthropological perspective, allowing reference to the secret to "remain close to the social surface" through veiled allusions plays a more important role in some ways than the secret content itself, as it mobilizes the secret as a kind of symbolic capital.
Affirmation of the feminine, antinomian and taboo
thumb|upright|Tibetan [[Chakrasamvara statue in Yab-Yum union with his consort Vajravārāhī]]
Some Vajrayāna rituals traditionally included the use of certain taboo substances, such as blood, semen, alcohol, and urine, as ritual offerings and sacraments, though some of these are often replaced with less taboo substances such as yogurt. Tantric feasts and initiations sometimes employed substances like human flesh, as noted by Kahha's Yogaratnamala.
The use of these substances is related to the non-dual (advaya) nature of a Buddha's wisdom (buddhajñana). Since the ultimate state is in some sense non-dual, a practitioner can approach that state by "transcending attachment to dual categories such as pure and impure, permitted and forbidden". As the Guhyasamaja Tantra states, "the wise man who does not discriminate achieves Buddhahood". The Candamaharosana Tantra (viii:29–30) states: