There is a Buddhist school whose goal was to make the body itself into a thunderbolt — indestructible, awakened, a Vajrakaya — and whose method was to move. Not to sit, not to chant words, but to perform sequences of physical movement its practitioners called Kayagita: "singing with the body."1 The Sahajayana flowered in Bengal, aimed at realizing voidness through what it named Mahasukha, Great Bliss, in body and mind. Then, in Dukes's telling, it touched Hindu Tantrism, "rapidly degenerated into a teaching of depravity," and vanished — taking nearly all record of its physical practices with it.2 What Dukes wants from it is the hint: a left-handed school that pursued awakening through codified movement, possibly feeding the history of Kempo.3
The Sahajayana is "one branch of the 'left-handed' Vajrayana" — so it sits at a definite spot on the pure/mixed grid: left-handed, and (as Hindu-influenced) mixed.4 Dukes flags it as "relevant to the history of Kempo" because of its method, not its metaphysics.3
The goal: the Vajrakaya, the "Thunderbolt Body" — the diamond-indestructible body that is the somatic counterpart of awakening.5 The means: "physical movements and sequences termed Kayagita (singing with the body)."1 The aim restated in its own terms: "to realize voidness by means of what was symbolically designated Mahasukha (Great Bliss) in one's body and mind."6 Three pieces — a bodily goal (Vajrakaya), a kinetic method (Kayagita), and a felt state (Mahasukha) — bound into one practice. This is movement-as-realization, the same family as the nata: the body is not the obstacle to voidness but the instrument that sings it.
Then the narrative turns. "Popular in the Bengal region of India, it become influenced by Hindu Tantrism and rapidly degenerated into a teaching of depravity advocating Maithuna (ritual sexual intercourse) and other titillations. It soon lost its significance as a Buddhist school and was eventually ignored."2 Because of that collapse, "we have very little information concerning its overall physical practices and trainings."2 The very thing Dukes wants — the movement curriculum — is the thing the school's reputation buried.
Walk the mechanism the name gives you. Kayagita — singing with the body. A song is not a single note; it is a sequence, ordered in time, that produces a state in the singer and listener. Map that onto the body and you get prescribed movement-sequences whose purpose is to generate Mahasukha — to sing the body into Great Bliss, and through that bliss into voidness. The movement is not warm-up or symbol. It is the carrier wave for the realization, the way a melody carries an emotion no single note holds.
That is why the Vajrakaya is the goal and not just a metaphor. If bliss-through-movement is the path, the destination is a body — transformed, diamond-stable, awakened in its very tissue. The logic is somatic from end to end: move the body, raise the bliss, realize the void, fix the result in flesh as a thunderbolt-body. Strip out the Bengal scandal and what remains is a clean, self-consistent kinetic soteriology — which is exactly why Dukes suspects it touches the ancestry of Kempo.
This page extends the vault's movement-meditation spine into its most explicitly bliss-driven form. Nata Kinetic Practice is movement-as-meditation; Sahajayana is movement-as-bliss-as-realization — the same somatic instinct with the felt-tone foregrounded. Vajrayana Pure/Mixed Classification gives the coordinate; this page is what occupies the left-handed/mixed corner. Tantric Left-Hand/Right-Hand Path gets a concrete instance of a left-handed school and the reputational fate Dukes assigns it. And for the book's martial through-line, Kayagita is the missing-and-lost prototype: a codified bliss-generating movement sequence that might sit upstream of Kempo, evidenced exactly by its absence.
Read the collapse sentence as a piece of authorial framing, because it is doing more than reporting.2 "Rapidly degenerated into a teaching of depravity" is not neutral description — it is a moral verdict, delivered in the voice of a practitioner-scholar defending a lineage. The trigger of the "degeneration," in this telling, is Maithuna, ritual sexual intercourse, arriving with Hindu Tantric influence. The structure is: pure Buddhist movement-school → Hindu contamination → sexual practice → depravity → extinction. Bliss-through-movement, fine; bliss-through-sex, depravity.
Hold this against the vault's Kiss-of-the-Yogini corpus and the verdict cracks open. White reads exactly these Maithuna-centered practices not as decadence but as the original operative core of the tradition — the sexual rite as the literal, foundational mechanism, later sublimated and overwritten by respectable internalized versions. On White's reading, Dukes has the arrow backwards: the sexual practice is not a late degeneration of a pure movement school but plausibly nearer the source, with the bodiless, decorous readings being the later development. So Dukes's "degeneration into depravity" is [CONTESTED] — it is devotional editorializing from a lineage that needs its ancestry clean, in direct tension with the vault's critical-historical account that treats the sexual rite as primary, not as corruption. Preserved as a live tension, resolved by neither side. [DO NOT FILE the "depravity" verdict as fact — document, don't endorse.]
You will never see this one performed, and that is the lesson. You go looking for the Kayagita sequences — the actual movements that sang the body into Great Bliss — and you find a locked door. Dukes tells you plainly: "we have very little information concerning its overall physical practices." So you stand at the threshold of an absence. You can feel the shape of what's missing: a bliss-generating movement curriculum aimed at a thunderbolt-body, popular enough in Bengal to matter, gone because the school's reputation poisoned its archive. You hold the three words you do have — Vajrakaya, Kayagita, Mahasukha — and let them tell you what kind of practice it was without letting you do it. This is the practitioner's hardest workflow: sitting with a technique known only by its goal and its name, refusing to invent the movements the record withholds.
The source is Dukes's brief, hedged account ("may have been relevant," "it is said however").3 He is candid that the physical record is nearly gone, which makes the Kempo-relevance claim necessarily speculative. The factual core — a left-handed Bengal school pursuing Vajrakaya via Kayagita toward Mahasukha — is reported plainly; the evaluative core — "depravity," "degenerated" — is editorializing that the vault flags rather than inherits.
Open: is the "degeneration via Maithuna" narrative supported by any source, or is it the standard reformist trope that recodes a tradition's sexual core as decline? White's corpus suggests the latter. And the deeper open question Dukes himself raises: did anything of the lost Kayagita movement actually feed Kempo, or is the connection an attractive guess across an evidentiary void?
Dukes writes as a Buddhist practitioner-scholar with a stake in a clean lineage, and the Sahajayana passage shows the stake plainly: a Buddhist movement-school is praised, its Hindu-tantric sexual turn is condemned as depravity, and its extinction is treated as deserved. Set against the vault's White (Kiss of the Yogini, Alchemical Body) the disagreement is structural, not cosmetic. White does not moralize the Maithuna; he reads it as the operative substance the later tradition sublimated and hid. So where Dukes sees a fall from purity into sex, White sees the original mechanism being overwritten by respectability. The page keeps both. Dukes's account preserves the movement angle White underweights — Kayagita as codified kinetic practice — while White preserves the substance angle Dukes recodes as depravity. Neither is discarded; the "degeneration" verdict is quarantined as [CONTESTED] devotional framing, and the convergence — that this was a body-centered Bengal school aiming at bliss and voidness — stands.
Archive Silence as Evidence — Historians learn to read what isn't there: a tradition whose records were destroyed, suppressed, or never kept tells a story precisely in its gaps. The Sahajayana is a sharp case. Dukes says the physical practices are nearly unrecoverable because the school was discredited and "eventually ignored" — the reputational collapse is also the archival cause.2 The historical frame supplies the method: treat the silence as a datum, ask who benefited from the erasure, and notice that a moralizing verdict ("depravity") and a vanished archive often travel together. The insight neither domain produces alone: the religious frame reads the extinction as deserved decline; the historical frame reads it as a erasure with an author — the same reformist standpoint that calls the practice depraved is the standpoint that lets its record lapse. Calling a tradition depraved and then losing its books are not two facts but one move seen twice.
Moral Reframing as Erasure — Behavioral-mechanics knows that the most effective way to remove a rival practice is not to ban it but to re-describe it: relabel it "depraved," and its own potential defenders fall silent, its transmission starves, its archive rots untended. Dukes's "rapidly degenerated into a teaching of depravity" is that relabeling in action, whether or not he intends it tactically. The tactical literature supplies the move; this page supplies a centuries-long outcome — a whole school's kinetic curriculum lost, leaving only its goal-word and method-name. The joint insight: moral reframing is a slow-acting erasure technology, and the proof of its power is exactly the thing Dukes laments — that we have "very little information." The condemnation did not just judge the school. It deleted it. And the deletion is now indistinguishable, in the record, from the school having had nothing worth keeping.
Sharpest implication: the clearest evidence of how completely a tradition was erased is that we now have to take its erasers' word for why — Dukes can call the Sahajayana depraved precisely because the school left almost nothing behind to answer the charge.
Generative questions: