Essay seed — from the Bodri clusters A–Q generative tail. Not drafted; this is the argument and the spine.
A man who has spent forty years in a tradition warns you about a specific danger, and the warning is more precise than any outsider's critique of that tradition has ever been:
different schools "end up using a very similar vocabulary but are actually describing very different spiritual phenomena."
His example is exact. The Upaniṣadic soul as a bird escaping a cut net, and the Buddha's bird escaping its cage. Identical image, different attainment. The yin shen and the thought-born body, described in almost the same words, not the same thing. And then the sentence that should stop anyone comparing anything:
"and yet if no one told you this, there would be no way for you to know, because the descriptions sound so similar."
Here is why that sentence is not a footnote about translation. A vocabulary is a lagging indicator of a capability. The words for a state survive long after anybody in the room can enter it — and nothing about the words changes when the capability goes. That is what makes the failure invisible from inside: the tradition still says everything it used to say.
Move one — the outside view. Start where it is easy to see: somebody else's tradition. The corpus does this well, and it does it as a general mechanism rather than a slur. A scheme built for a lay audience acquires practices, then a medical structure, then everyday users who never cultivated. The terminology hardens into a fixed asset with dependencies built on top of it. Cite Identical Metaphor, Different Attainment and A Tradition's Ceiling Is Set by Its Codifiers.
Move two — the inside view, from a completely different corpus. The vault has watched this happen from the other side. Terminology drift in the Kāpālika and Kaula recensions, where the same words attach to different practitioners across three centuries. Knowledge halving down a lineage until what is transmitted is the shape of the thing. Cite Terminology Drift and The Halving of Knowledge Down the Lineage. Neither corpus knows about the other and they describe the same process. Which is itself the essay's best evidence that the process is real.
Move three — the turn, and it is the part worth writing. Every account of this treats it as decline: something was there and got lost. But there is a second reading with the same evidence. A vocabulary that outlives its referent is not only a ruin — it is a specification. The words are a description precise enough that somebody could, in principle, build the thing again from the description. The Song-dynasty diaries that later practitioners misread as instructions were misread because they were good enough to look like instructions.
So the same artifact is simultaneously the evidence that the capability is gone and the only remaining route back to it. And there is no way to tell, from inside, which of those you are holding.
Move four — the reader's version. This is not about mysticism. Every field has words whose referents thinned while the words held: craft, editing, apprenticeship, mentorship, research. A word that everybody still uses fluently and nobody can currently demonstrate is the most dangerous object in a discipline, because fluency in it reads exactly like competence at it.
You cannot detect the loss of a capability by listening to how a field talks about it — and talking about it well is the last thing to go.