Tantra
Proto-Tantric elements in Vedic religion

The Keśin hymn of the Rig Veda (10.136) describes the "wild loner" who, states Karel Werner, "carrying within oneself fire and poison, heaven and earth, ranging from enthusiasm and creativity to depression and agony, from the heights of spiritual bliss to the heaviness of earth-bound labor". The Rigveda uses words of admiration for these loners, and whether it is related to Tantra or not, has been variously interpreted. According to David Lorenzen, it describes munis (sages) experiencing Tantra-like "ecstatic, altered states of consciousness" and gaining the ability "to fly on the wind". In contrast, Werner suggests that these are early Yoga pioneers and accomplished yogis of the ancient pre-Buddhist Indian tradition, and that this Vedic hymn is speaking of those "lost in thoughts" whose "personalities are not bound to earth, for they follow the path of the mysterious wind".

The two oldest Upanishadic scriptures of Hinduism, the Brihadaranyaka Upanishad in section 4.2 and Chandogya Upanishad in section 8.6, refer to nadis (hati) in presenting their theory on how the Atman (Self) and the body are connected and interdependent through energy carrying arteries when one is awake or sleeping, but they do not mention anything related to Tantric practices. The Shvetashvatara Upanishad describes breath control that became a standard part of Yoga, but Tantric practices do not appear in it. Likewise, the Taittiriya Upanishad discusses a central channel running through the body and various Vedic texts mention the bodily pranas (vital breaths) that move around in the body and animate it. However, the idea of consciously moving the bodily pranas through yoga is not found in these sources. According to Lorenzen, Vedic ideas related to the body later diversified into the "mystical anatomy" of nadis and chakras found in Tantra. The yogic component of Tantrism appears clearly in Bāṇabhaṭṭa 's Harshacharita and Daṇḍin 's Dashakumaracharita. In contrast to this theory of Lorenzen, other scholars such as Mircea Eliade consider Yoga and the evolution of Yogic practices to be separate and distinct from the evolution of Tantra and Tantric practices.

According to Geoffrey Samuel, the inner development of a spiritual energy called tapas becomes a central element of Vedic religion in the Brahmanas and Srauta texts. In these texts, ascetic practices allow a holy man to build up tapas, a kind of magical inner heat, which allows them to perform all sorts of magical feats as well as granting visions and divine revelations. Samuel also notes that in the Mahabharata, one of the commonest use of the term "yoga" refers to "a dying warrior transferring himself at death to the sphere of the sun through yoga, a practice that links up with Upanisadic references to the channel to the crown of the head as the pathway by which one can travel through the solar orb to the World of Brahman." This practice of transferring one's consciousness at death is still an important practice in Tibetan Buddhism. Samuel also notes that sexual rituals and a spiritualized sexuality are mentioned in the late Upanishads. According to Samuel, "late Vedic texts treat sexual intercourse as symbolically equivalent to the Vedic sacrifice, and ejaculation of semen as the offering." This theme can be found in the Jaiminiya Brahmana, the Chandogya Upanisad, and the Brhadaranyaka Upanisad. The Brhadaranyaka contains various sexual rituals and practices which are mostly aimed at obtaining a child which are concerned with the loss of male virility and power.

David Gordon White views Yogini cults as foundational to early tantra but disagrees with scholars who maintain that the roots of such cults lie in an "autochthonous non-Vedic source" such as indigenous tribes or the Indus Valley civilization. Instead, White suggests Vedic Srauta texts mention offerings to goddesses Rākā, Sinīvālī, and Kuhū in a manner similar to a tantric ritual. Frederick Smith – a professor of Sanskrit and Classical Indian Religions, considers Tantra to be a religious movement parallel to the Bhakti movement of the 1st millennium AD. Tantra along with Ayurveda, states Smith, has traditionally been attributed to Atharvaveda, but this attribution is one of respect not of historicity. Ayurveda has primarily been an empirical practice with Vedic roots, but Tantra has been an esoteric, folk movement without grounding that can be traced to anything in Atharvaveda or any other vedic text.
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