Although at one point the Indic origin of kīla practice was widely questioned, Boord claims that "the existence of a Kīla cult among the Buddhists in eighth century India...must now surely be accepted as established" and further claims that it has been "conclusively demonstrated that all the basic doctrines and rituals of Vajrakīla had their origin in India." Robert Mayer, one of the leading scholars of the kīla literature, shares the same view, writing that prior research had been plagued by "elementary misunderstandings" based on a lack of familiarity with crucial Indic primary sources. Mayer says of Boord's work, "our understandings of the deity are quite similar" insofar as both do not doubt that "the phur-pa and the deity are Indic." Tibetan tradition, which Boord credits as generally credible, holds that the entire corpus of Indian kīla lore was systematized by
Padmasambhava,
Vimalamitra, and the Nepali
Śīlamañju, while on retreat together at
Yang-le-shod (present-day Pharping, Nepal). According to Boord, "it was precisely during this retreat that the many strands of kila lore were finally woven together into a coherent masterpiece of tantric Buddhism and thus it helps to illuminate the process by which tantric methods were being related to
soteriology at this time. Beautifully codified in terms of both theory and practice, this divine scheme of meditation and magic was subsequently transmitted to Tibet and became established there as one of the major modes of religious engagement. So much so, in fact, that many previous writers on Tibet have actually assumed the kila cult to be of Tibetan origin." Renowned Tibetologist and Buddhologist
Herbert Guenther concurred in a review of Boord's work, concluding that his "careful research of all available texts relevant to the study of this figure" was "much needed and long overdue" in correcting longstanding "misrepresentation of historical facts."
Beer conveys the entwined relationship of Vajrakilaya with
Samye, the propagation of
Secret Mantra in Tibet, and the importance of the sadhana to both Padmasambhava's enlightenment, and his twenty-five 'heart disciples', who are of the
mindstreams of the principal
terton (according to Nyingma tradition): There are a number of
terma teachings founded on Vajrakilaya. For instance, there are treasure teachings from
Jigme Lingpa,
Ratna Lingpa and
Nyang-rel Nyima Ozer. ==In Bon==