The oldest Buddhist progress scale doesn't measure states. It measures how many more times you have to come back.
Srotāpanna — Stream Winner. Seven more human lives. Sakṛdāgāmin — Once More to Return. One. Anāgāmin — No Returner. None in the Desire Realm, ever again. Arhat — done.1
That's an unusually hard-edged way to build a ladder, and it's worth noticing what it does. There's no vocabulary here about luminosity or joy or spaciousness. Each rung is a number, and the number is a debt. The four get set beside two other schemes — the Taoist five classes of Immortal, and a set of ten categories of Indian seers — and the comparison is where the page earns its keep. Because the three ladders aren't measuring the same quantity at all.
The mechanism is specific and it runs on a distinction most summaries drop: views versus thoughts. The Srotāpanna "has cut through the five entanglements of perspectives (views) identified with the volition skandha, and yet he has not yet been liberated from the entanglements, or attachments to mental states."2 Put plainly: he has rid himself of the deluded views of the Three Realms… but not the deluded thoughts associated with those realms.2
So the first rung removes a set of positions — the structural misreadings of what the realms are. It leaves the habits untouched. What changes behaviourally is real but partial: "He has definitely eliminated a great deal of envy, avarice, denigration, disputatiousness, deceit and hypocrisy because he is free of the heavier, coarser passions, but he still has other mental defilements."2
Then the Sakṛdāgāmin starts on the thoughts. Buddhism grades deluded thoughts into nine levels; this stage eliminates the first six and not the last three, which are subtler.3 And the striking detail: "These thoughts don't originate from one lifetime but from many lives."3
The Anāgāmin cuts the habits of desire outright — "so they can leave the Desire Realm forever" — and is reborn in the Form Realm, though "only the lowest heavenly levels."4 The gloss attached is the honest one: this stage of spiritual cultivation is “still rather incomplete.”4 Views first, then coarse thoughts, then fine ones. Each rung is a specified quantity of a specified thing, which makes this the most auditable scheme in the book.
There's a reason the first two rungs stop where they do, and it's the sharpest diagnostic on the ladder. Both the Stream Winner and the Once-Returner are reborn in Desire Realm heavens rather than Form Realm ones — despite everything they've cut — and the cause given is blunt: “in their cultivation practice they have only bothered to suppress sexual desire rather than really uproot it, and so despite their accomplishments, desire still remains.”8 Suppression carries you two rungs and then stops carrying you, and the ceiling it produces is a destination rather than a feeling.
Which also tells you what the rebirth count is actually counting. It isn't gong-fu. “Buddhism not only provides rankings of cultivation accomplishment in terms of physical gong-fu, but as we see here it provides rankings in terms of personal virtue as well” — and it's “as a result of their virtue” that the Once-Returner needs only one more human birth, because reduced afflictions mean “the pulls of karma only have the power for causing one more rebirth in the human realm.”8 The number is a measure of remaining karmic force, and karmic force is a function of conduct.
So the escape condition is stated as a threshold rather than as a duration: cut all nine levels of deluded thought and “you can leave the Realm of Desire once and for all.”8 Six of nine buys you one more life. Nine of nine buys you out.
One line matters more than its placement suggests:
Of course he can still regress from this stage of progress if he doesn't continually make spiritual efforts at cultivation during these lives, but at least he has "entered the stream."2
The Stream Winner can fall out of the stream. Which means the seven-lives figure isn't a schedule — it's a forecast that holds only if you keep working, and the framework says so. That puts this scale in the same family as the bhūmi ladder, where nothing before the eighth rung is safe. Two independent schemes agreeing that most of the path is reversible is a more interesting convergence than most of the ones the book makes explicitly.
And the phrase hung on the stage is the sharpest thing on the page:
He's entered the stream because he recognizes that the fundamental nature of arising is empty, for each moment of existence is actually the visaya of emptiness. Therefore in this entering of "entering the stream," there is no entering.2
The name of the first rung is corrected by the content of the first rung. What you realise on arriving is that nothing arrived anywhere.
Now set the Taoist five classes beside it and watch the axis change.5
Ghost immortal — immortal in the realm of the dead, spirit dim, "neither name nor title," wandering "in limbo between the realms of the living and the dead," and their existence ends if they choose human rebirth.
Human immortal — "someone who cultivates but does not understand the Tao. Knowing only one method and practicing only one technique in that method, they work on one aspect of cultivation all their lives." The result: "the vapors of the five elements interact haphazardly and they have no control over the transformations inside their bodies."
Earth immortal — halfway. "Because they do not have a complete understanding of the Tao, they can be content with only a moderate level of spiritual attainment… the best they can do is to live forever in the human realm and not die."
Spirit immortal — the technical description, and it's entirely physiological: connected all the parts of the body, used lead to replenish mercury, channelled refined generative energy to the top of the head, transformed the jade nectar into elixir, bodily form transmuted into vapour, five vapours reverted to one, three yang essences gathered at the crown, mundane body transformed into subtle body, yin residues purged.
Celestial immortal — spirit immortals "who dwell in the three islands" and "have accumulated enough merits by teaching humanity about the Tao," summoned by celestial decree, "fulfilling their duties as judges and officials within the celestial administration."
Read the two ladders together and the difference isn't one of detail. The Buddhist scale counts remaining rebirths. The Taoist scale grades completeness of a physiological transformation, with a bureaucratic promotion at the top. The human immortal's defect is technical narrowness — one method, one technique, uncoordinated vapours. The earth immortal's defect is complacency. Neither is a count of anything.
A join gets asserted:
This normal cultivation stage of the Great Arhat is equivalent to the stage of the Great Golden Immortal in Taoism.6
And the general claim underneath it:
the Buddhist Arhats and great Immortals of Taoism are individuals who have successfully reached the stage where their chi has transmuted into shen and shen has transmuted into emptiness.7
That's the bridge, and it's doing enormous work. It converts two incommensurable scales — one counting births, one grading a bodily transformation — into one scale by translating both into the jing-chi-shen sequence.
Whether it holds is a real question and it never gets asked. The Taoist descriptions are explicitly about chi and shen, so half the translation is free. The Buddhist stages aren't — nothing in the Srotāpanna's definition mentions chi, and the criterion given is views and thoughts cut, measured in rebirths owed. Mapping seven more lives onto chi transmuted into shen requires a bridging claim about what a rebirth-debt physically consists of, and no such claim is offered.
What makes it more than a quibble is that the equivalence is load-bearing for the whole comparative project. If the two ladders really measure one thing, cross-tradition ranking is possible. If they measure different things, then every ranking of a Taoist adept against a Buddhist one — and the book does this repeatedly — is a category error dressed as a scale.
The honest version is available and nearly gets said: both traditions describe a sequence of refinement, both agree it has stages, and both put a physiological transformation somewhere in it. That's a structural parallel. It isn't a shared unit of measurement.
There's a fourth ladder mentioned in passing, and the passing is the point. Vedic culture's equivalents "were called rishis or seers rather than Arhats, and most were only able to cultivate their chi to shen rather than reach the stage of truly seeing the Tao."7 And Shakyamuni "spoke of ten categories of Indian Immortals in the Śūraṅgama, who had cultivated their chi and shen and learned how to solidify their false thoughts."7
Notice the move. The Indian seers are annexed to the scale and graded down in the same sentence — the same annex-then-grade pattern the book runs on Egyptian, Greek and Kung material. And the grading criterion is the jing-chi-shen sequence again, applied to a tradition that doesn't use it.
There's also a bare assertion with no detail behind it — “Ancient Egypt had a similar ranking scheme of spiritual cultivation accomplishment, as did ancient India as well.”7 No source, no scheme named, no content. Recorded, not carried.
What emerges across the four is a consistent shape: every tradition's ladder gets restated in chi-and-shen terms and then placed relative to the Buddhist one. The translation is always in the same direction. Nothing is ever restated in Taoist or Vedic terms to see how Buddhism scores.
The top of the Arhat scale has more headroom than the four stages suggest:
The Arhats can access the Form Realm heavens with ease and the great Arhats can even access the Formless Realm Heavens! That's why people sometimes call Buddha a Great Golden Arhat, which is the highest level of Arhat possible.6
So "Arhat" spans from someone with seven human lives still owed to Shakyamuni. That's an enormous range under one word, and the awkwardness gets flagged in place: in the strictest technical sense the Buddha is a Great Arhat, “but his stage of 'Great' is far beyond the normal stage of the Great Arhats, such as his students Mahakashyapa and Subhuti.”6 Great is doing two different jobs in one sentence, and the vocabulary has run out.
And a consequence drawn from it that's worth keeping:
This also helps you understand why so many cultivation schools fail to mention the formless samadhi, or why they mistakenly identify the formless absorptions as enlightenment or liberation when this is far from the truth. The reason they don't mention them is because so very few people can access these states.6
That's a supply-side explanation for a doctrinal gap. A tradition's map stops where its practitioners stopped — not because anyone decided to omit anything, but because nobody came back with a report.
You've read three ladders and you want to know what to do with any of them. Ignore the rungs. Take the criterion instead, because the criteria are usable and the rungs aren't.
The Buddhist scale's criterion is the sharpest and it's the one nobody applies to themselves: views first, then coarse habits, then fine ones. A view is a position you hold about how things are. A habit is something you do regardless of what you hold. So, on one page, write two columns.
Left: three things you believe about how life works that you didn't believe five years ago. Real changes of position — about what matters, what's possible, what you owe people.
Right: three things you did this month that you'd have done five years ago, unchanged.
Almost everyone finds the left column fills easily and the right column is embarrassing. That gap is exactly what the Srotāpanna stage describes: views cut, thoughts intact. It's not failure — it's the expected first result, and the tradition allocated seven lifetimes to the remainder.
The Taoist criterion gives you the other check, and it's a good one: do you know one technique or do you understand the thing? The human immortal's whole defect is "knowing only one method and practicing only one technique in that method" for a lifetime, with the vapours interacting haphazardly. Ask whether you could explain why your practice works, or only that it does. If only the second, you're running one technique — which is fine, and is the named ceiling.
Neither check tells you which rung you're on. Both tell you what to do next, which the rungs never will.
The strongest content is the views/thoughts distinction with its rebirth accounting, because it's the most auditable claim in the corpus: a specified quantity of a specified thing removed at each rung, with the remainder named.23 The central tension is the equivalence claim. Two ladders measuring different quantities — remaining rebirths in one, completeness of a bodily transformation in the other — are joined by translating both into jing-chi-shen, and the Buddhist half of that translation is asserted rather than argued.67 Every cross-tradition ranking in the book depends on the join holding.
A second tension: the four-stage scale is calibrated in rebirths owed, and its top rung is occupied by beings who — on the account carried at The Arhat's Remainder — will eventually be reborn without control. The unit runs out before the problem does. A third: "Arhat" covers everything from seven-lives-remaining to Shakyamuni, and Bodri has to write Great twice in one sentence with two meanings to say so.6 Recorded and not carried: "Ancient Egypt had a similar ranking scheme… as did ancient India as well" — no source, no scheme named, no content.7 And the Vedic seers annexed to the chi-shen scale and graded down in the same sentence, per the book's standing annex-then-grade pattern.
Open question: the supply-side explanation for doctrinal gaps — traditions don't mention the formless absorptions because almost nobody reached them — is genuinely testable in shape. It predicts that a tradition's map should stop precisely where its best documented practitioners stopped, rather than at a doctrinally motivated boundary. Does the historical record support that, and would it distinguish a gap in attainment from a gap in what got written down?
Bodri wants two things from these ladders and they pull apart. He wants them to be comparable, because the comparative grid is the book's whole method — which requires a common unit, supplied by jing-chi-shen. He also wants them to be independent, because independent convergence is what makes the comparison evidence rather than assertion. But a scale that has been restated in another scale's units is no longer independent of it, and every one of these ladders is restated in Buddhist-adjacent physiological terms before being compared.
The direction of translation is the tell. Taoist immortals get read as chi-and-shen stages; Vedic seers get read as chi-to-shen without seeing the Tao; the Arhat scale is the frame. Nothing is ever converted the other way.
Against Buddhism as a Comparative Reference Grid, this is that instrument doing its characteristic work, and the cost is visible here more than anywhere: two genuinely different measurement schemes are declared equivalent by a bridging claim that is asserted once and never defended. Against The Bhūmis on Three Axes, the contrast is instructive. The bhūmis fail as a ruler because five accounts run on four axes. This scale succeeds as a ruler — one axis, rebirths owed, consistently applied — and fails somewhere else: the unit stops being meaningful at the top rung, where beings who owe nothing are reborn anyway.
Against Physical Immortality as Taoism's Distinctive Claim, the earth immortal is that claim's exact address — "the best they can do is to live forever in the human realm and not die," described as a shortfall, by a Taoist source.5 Deathlessness graded as the third of five, and the grading is internal.
The vault's page on Comparative Method in Historical Science: The Logic of Natural Experiments holds that a comparison licenses a conclusion only when the cases are measured on a variable defined independently of the frameworks being compared — otherwise the comparison returns whatever the shared measure was built to detect. That's precisely the join being made here, and this is the cleanest instance of the problem in the whole corpus, because the two scales are so plainly measuring different things. One counts rebirths owed. The other grades a bodily transformation through named alchemical operations — lead replenishing mercury, jade nectar into elixir, three yang essences at the crown. To rank a Sakṛdāgāmin against an earth immortal you need a common variable, and the one supplied is jing-chi-shen: a scheme native to the Taoist side of the comparison.
So the shared measure isn't independent of the cases. It's one of them. The insight the pair produces is a discriminating test rather than a rejection, and the test is available. If the two ladders really track one underlying process, then the traditions should agree on ordering even where their vocabularies don't overlap — a practitioner both traditions could observe should land in corresponding positions on both scales, and the correspondence should hold across several such practitioners. That's checkable in principle, and it's the kind of thing the Chinese Buddhist–Taoist contact of the Tang and Song eras had ample opportunity to generate.
If instead the scales only agree where the vocabulary was already shared — which is what the chi transmuted into shen bridge suggests — then the equivalence is an artefact of the translation and the rankings built on it are measuring the translator. Run it the other way and the historical-science page inherits the harder version of its own problem. Its examples compare cases against variables an outside observer can measure. Here there's no outside observer: both scales are calibrated by attainments only the attained can verify, which means the independence condition can't be satisfied even in principle. That's not a reason to abandon the comparison — it's the reason the honest conclusion is structural parallel, which the evidence supports, rather than equivalent stage, which it doesn't.
(One handshake. The doctrinal material is the source's own territory and is carried on its sibling pages.)
Sharpest implication: the Buddhist scale is the most auditable instrument in the book precisely because it measures a debt rather than a state — a number of remaining births, with a named quantity of views and thoughts cut at each rung. And it's joined to a Taoist scale measuring bodily transmutation by a bridge made of chi and shen, which belongs to one side of the comparison. The most rigorous ladder in the corpus is comparable to the others only by a move that dissolves its rigour.
Generative questions: