The Fourfold Challenge — and the Dream, the Ghost, and the Hell That Answer It
This page carries Ru-Yi's translation of Part One of Vasubandhu's Viṃśatikā, the "Twenty Verses" (唯識二十論). Vasubandhu opens by stating his thesis plainly — the three realms are consciousness-only — and an opponent immediately objects: if there is truly no object outside the mind, how can a mental image ever be pinned to one place, one time, shared consistently among many separate onlookers, and still cause real effects in the world? Vasubandhu answers first with dreams and hungry ghosts, then with a single sweeping simile — hell itself — before turning to dismantle three rival schools' own explanations of who, or what, the tormentors in hell actually are.
Translation Method
The Chinese source is Xuánzàng's seventh-century translation of Vasubandhu's Viṃśatikā (唯識二十論, T1590), completed in a single week in 661 CE. Unlike Vasubandhu's later Triṃśikā — the "Thirty Verses," translated on this site as part of the Cheng Weishi Lun — this earlier, shorter treatise carries Vasubandhu's own prose commentary directly beneath each verse, so no outside commentator is needed to establish the root argument. For a second layer of reading, we follow Kuījī, Xuánzàng's direct disciple and the actual founder of the Faxiang school, whose commentary (唯識二十論述記, T1834) survives as detailed notes taken during the very week of translation, when Kuījī served as Xuánzàng's own amanuensis.
Classical text is set in the left-hand column below, our English in the right. Reading notes drawn from Kuījī's commentary follow each passage. See also this site's note on translation method.
Twenty Verses, Not Thirty
The Sanskrit title, Kuījī explains, is built from four pieces — vijñapti (識, consciousness), mātra (唯, "only"), viṃśati (二十, "twenty"), and śāstra (論, "treatise") — giving Viṃśatikā, "the Twenty-Verse Treatise," named simply to distinguish it from Vasubandhu's own Triṃśikā, the "Thirty Verses." Two earlier Chinese translations already existed, by Bodhiruci in the Wei dynasty and by Paramārtha in the Chen dynasty, but Xuánzàng found both faithless to the Sanskrit he had brought back — one padded with extra verses, the other short on prose — and retranslated the treatise from scratch, checked line by line against Sanskrit manuscripts.
Kuījī frames the difference between Vasubandhu's two "Consciousness-Only" treatises directly: the Triṃśikā expounds the Yogācāra position at length and in full, but is verse only, without Vasubandhu's own commentary — later Indian masters had to supply that themselves, which is exactly the compilation this site's Cheng Weishi Lun translates. This treatise, the Viṃśatikā, was written earlier, and takes the opposite role: instead of building the positive doctrine, it exists to demolish, one by one, every objection a rival school might raise against it. Both treatises argue for the same conclusion, Kuījī says, but through "a thousand gates," so that whichever a given reader can enter through, they may enter.
1. The Opening Thesis
Before any verse begins, Vasubandhu states his position directly in prose: the three realms — desire, form, and formless — are consciousness-only. He grounds this in scripture, defines his terms precisely, and previews the simile that will carry the entire treatise: a clouded eye that sees hairs and flies where nothing real exists at all.
安立大乘三界唯識，以契經說三界唯心，心、意、識、了，名之差別。此中說心，意兼心所，唯遮外境，不遣相應，內識生時似外境現，如有眩瞖見髮蠅等，此中都無少分實義。即於此義，有設難言。
We set out, within the Great Vehicle, that the three realms are consciousness-only — because a scripture says that the three realms are mind-only. "Mind," "intent," "consciousness," and "cognizing" are different names for one and the same thing. Here, speaking of "mind" also includes what accompanies it, the mental factors; this excludes only an external object, it does not exclude what accompanies mind. When the inner consciousness arises, it appears as though an external object were present — just as someone with a clouded eye sees hairs and flies where there is nothing real in the slightest degree. Concerning this very point, an objection has been raised.
Kuījī reads "mind, intent, consciousness, cognizing" (心意識了) as four names Buddhist texts use for the same underlying reality, distinguished only by which function is emphasized: "mind" (心) for its accumulating function — gathering seeds, in the case of the ālayavijñāna specifically; "intent" (意) for its function of deliberation, above all the seventh consciousness's constant, subtle calculation; "consciousness" (識) for the general function of discernment shared by all eight; and "cognizing" (了) as a catch-all covering whatever the other three leave unnamed. He is equally precise about what "consciousness-only" does and does not deny: it denies an object existing outside and apart from mind, but it never denies the mental factors (心所) that necessarily accompany every moment of mind — so "mind-only," in scripture, was never meant to exclude anything but an external world.
2. The Fourfold Challenge
An opponent — Vasubandhu writes as though voicing the Sautrāntika school, though no real interlocutor is named — presses the obvious difficulty. If there is genuinely no object outside the mind, a mental image should be able to appear anywhere, at any time, unpredictably among any set of onlookers, and should never cause any real effect in the world. Since none of this is what actually happens, the opponent concludes, there must be a real external object after all.
頌曰：
「若識無實境， 則處時決定，
相續不決定， 作用不應成。」
A verse:
"If consciousness has no real object,
then the fixity of place and of time, the indeterminacy shared among many mind-streams, and the reality of function —
none of these should be possible."
論曰：此說何義？若離識實有色等外法，色等識生不緣色等，何因此識有處得生，非一切處？何故此處有時識起，非一切時？同一處時有多相續，何不決定隨一識生？如眩瞖人見髮蠅等，非無眩瞖有此識生。復有何因，諸眩瞖者所見髮等無髮等用，夢中所得飲食、刀杖、毒藥、衣等無飲等用，尋香城等無城等用。餘髮等物其用非無，若實同無色等外境，唯有內識似外境生，定處、定時、不定相續、有作用物皆不應成。非皆不成。
What does this mean? If, apart from consciousness, there really were external things such as form, then a consciousness of form would arise without needing form as its object at all — so why does this consciousness arise in one place, and not in every place? Why does it arise at one time, and not at every time? Why, when many mind-streams share the very same place and time, does it not arise indeterminately, in just any one of them at random, instead of the fixed and orderly way it actually does — the way a person with a clouded eye sees hairs and flies, though the sight never arises for someone without the clouding? And by what cause is it that what a person with clouded eyes sees — the hairs and the rest — has none of the function real hairs have; that the food, drink, weapons, poison, and clothing obtained in a dream have none of the function real food and drink have; that a phantom city conjured by a gandharva has none of the function a real city has — while other, real hairs and the rest are not without their function? If it really were true that, just as there is no external object such as form, there is only the inner consciousness appearing as if an external object were present, then a fixed place, a fixed time, an indeterminacy shared among mind-streams, and a thing with real function — none of these ought to be possible. We answer: they are not all impossible.
Kuījī works the challenge into a concrete example: if consciousness needed no real mountain to arise, why does the consciousness "there is Zhongnan Mountain" arise only when one is actually facing that particular mountain, rather than everywhere, all the time? He also catches something easy to miss in the Chinese: the objection is not really four separate arguments but one argument run through four tests — place, time, multiple witnesses, and function — and Vasubandhu will answer all four with a single closing move once the individual similes have done their work.
3. Answered, One Point at a Time: The Dream and the Hungry Ghosts
Vasubandhu's first answer moves through the four tests separately, each with its own simile. Place and time are answered by an ordinary dream; the sharing of one appearance among many separate minds is answered by hungry ghosts, who by a shared karmic ripening all see the same river of pus; and real function despite an unreal object is answered by nocturnal emission — the dream itself is empty, yet the body's loss is not.
頌曰：
「處時定如夢， 身不定如鬼，
同見膿河等， 如夢損有用。」
A verse:
"Place and time are fixed, as in a dream;
the mind-streams are indeterminate, as with hungry ghosts,
who together see a river of pus, and the rest;
and function, though illusory, is real, as when a dream brings real loss."
論曰：如夢意說如夢所見，謂如夢中雖無實境，而或有處見有村園男女等物，非一切處。即於是處，或時見有彼村園等，非一切時。由此雖無離識實境，而處時定非不得成。
"As in a dream" means: as what is seen in a dream. That is, although there is no real object in a dream, one may still see, in one particular place, a village, a garden, men, women, and the like — not in every place. And in that very place, one may see that village and garden at one particular time — not at every time. By this we see that, even though there is no real object apart from consciousness, the fixity of place and of time can still be established.
說如鬼言，顯如餓鬼。河中膿滿故名膿河，如說酥瓶其中酥滿。謂如餓鬼同業異熟，多身共集皆見膿河，非於此中定唯一見。等言顯示或見糞等，及見有情執持刀杖遮捍守護不令得食。由此雖無離識實境，而多相續不定義成。
"As with ghosts" means as with hungry ghosts, the pretas. A river is called a "river of pus" because the river is full of pus — the way one speaks of a "jar of ghee" simply because the jar is full of ghee. That is, hungry ghosts who share the same karma and the same karmic ripening, many bodies gathered in one place, all see a river of pus together; it is not that only one, fixed and alone, sees it. The word "and the rest" shows that some instead see it filled with excrement, and some see beings holding sticks and swords, standing guard over it, blocking them from the food. By this we see that, even though there is no real object apart from consciousness, the indeterminacy shared among many mind-streams can still be established.
又如夢中境雖無實，而有損失精血等用。由此雖無離識實境，而有虛妄作用義成。如是且依別別譬喻，顯處定等四義得成。
And again: although there is no real object in a dream, there is still a real loss of semen or blood, and the like. By this we see that, even though there is no real object apart from consciousness, illusory function can still be established as real. In this way, then, by separate similes, taken one at a time, the four points — the fixity of place, and the rest — are shown to be established.
Kuījī insists on a small but real point of grammar: "as in a dream" (如夢) is a simile-marker, not a claim that a dream itself is doing the perceiving — the thing being compared is what appears within the dream, not the dreaming mind, and mistranslating this had already tripped up an earlier Chinese version. He also traces the hungry-ghost example to an even older principle, shared with the Mahāyānasaṃgraha: one and the same river appears differently to a ghost, an animal, a human, and a god, each according to their own karma — proof that a single external "thing" was never needed to explain shared appearance in the first place, only shared karma.
4. Answered All at Once: Everything Is Like Hell
Having handled the four tests separately, Vasubandhu now offers one simile that resolves all four together — hell itself, where the condemned share a fixed place and time, share the sight of their tormentors with countless others, and genuinely suffer real harm, all without any of it requiring a real external object.
頌曰：
「一切如地獄， 同見獄卒等，
能為逼害事， 故四義皆成。」
A verse:
"All four are established together, as in hell:
the condemned together see hell-guardians and the rest,
who are able to torment and harm them —
and so all four points are established at once."
論曰：應知此中一地獄喻，顯處定等一切皆成。如地獄言，顯在地獄受逼害苦諸有情類。謂地獄中雖無真實有情數攝獄卒等事，而彼有情同業異熟增上力故，同處同時眾多相續，皆共見有獄卒、狗、烏、鐵山等物來至其所為逼害事。由此雖無離識實境，而處定等四義皆成。
It should be understood that here a single simile — hell — shows that the fixity of place, and all the rest, are established together. "As in hell" points to those beings who undergo tormenting suffering in hell. That is, although in hell there are no real sentient beings counted among the class of "hell-guardian" and the like, still, through the ripening power of those condemned beings' shared karma, many mind-streams, sharing the same place and the same time, together see hell-guardians, dogs, crows, iron mountains, and the like, come to that place to torment and harm them. By this we see that, even though there is no real object apart from consciousness, all four points — the fixity of place, and the rest — are established together.
One simile now does the work of four, Kuījī notes, because hell packages all four tests into a single scene at once: "same place" gives place-fixity, "same time" gives time-fixity, "many mind-streams together" gives the indeterminacy shared among many witnesses, and "come to torment and harm" gives real function — all without a single real hell-guardian anywhere in it. But the word "hell-guardian" itself is doing real philosophical work, not just scene-setting, and Vasubandhu is about to spend three more verses making sure no rival school can smuggle a real being, or even real matter, back in through that word.
5. Are the Hell-Guardians Real Beings?
The first rescue attempt, from the Mahāsāṃghika and Sāṃmitīya schools, is the simplest: hell-guardians are just ordinary sentient beings, born there like anyone else. Vasubandhu closes off every version of this — whether the guardians belong to the hell-realm itself or to some other realm entirely.
何緣不許獄卒等類是實有情？不應理故。且此不應那落迦攝，不受如彼所受苦故。互相逼害，應不可立彼那落迦。此獄卒等形量力既等，應不極相怖，應自不能忍受鐵地炎熱猛焰恒燒然苦，云何於彼能逼害他？非那落迦不應生彼，如何天上現有傍生，地獄亦然，有傍生鬼為獄卒等。此救不然。
Why is it not accepted that hell-guardians and their kind are real sentient beings? Because it is not reasonable. First, they cannot belong to the class of hell-beings themselves, since they do not undergo the suffering that hell-beings undergo there. Second, if they tormented and harmed one another as fellow hell-beings, it should be impossible to establish which are the condemned and which are the guardians at all. Third, since these hell-guardians are equal to the condemned in bodily form, size, and strength, the condemned should not be so utterly terrified of them — and the guardians themselves should be unable to bear the scorching heat and the ever-burning flames of the iron ground, so how could they go on to torment and harm others there? Suppose instead you say they are not hell-beings at all, and so should not be born there — but just as animals really are born in the heavens, so too, in hell, there might be animals or ghosts serving as the hell-guardians. This rescue, too, does not succeed.
頌曰：
「如天上傍生， 地獄中不爾，
所執傍生鬼， 不受彼苦故。」
A verse:
"As with animals born in the heavens,
so it is not in hell:
the animals or ghosts you claim as hell-guardians
do not undergo that place's own suffering."
論曰：諸有傍生生天上者，必有能感彼器樂業，生彼定受器所生樂，非獄卒等受地獄中器所生苦，故不應許傍生鬼趣生那落迦。
Any animal born in the heavens must have karma capable of bringing about the pleasure of that heavenly environment, and once born there, certainly experiences the pleasure that environment produces. But hell-guardians do not experience the suffering that hell's own environment produces — so it should not be accepted that animals or ghosts are born in hell as hell-guardians.
Kuījī lays out the logic as four separate blows, not one: hell-guardians cannot be ordinary hell-beings, because they do not suffer hell's torments; they cannot be tormenting fellow hell-beings, because then there would be no principled way to say who is condemned and who is guarding; their equal strength to the condemned means the condemned's terror is unexplained; and their exposure to hell's own fire, unprotected, means they could not long survive to torment anyone. The parallel to animals born in heaven looks tempting at first, he notes, but breaks apart on exactly the same test: a heaven-born animal really does enjoy that heaven's pleasures, while a "hell-guardian" by definition does not share hell's suffering — so the two cases are not, after all, alike.
6. Or Karma-Made Elements, Not Beings at All?
Sarvāstivāda's rescue is more sophisticated: the hell-guardians are not sentient beings at all, but non-sentient matter — "great elements" directly produced by the condemned beings' own karma, merely labeled "guardian" for convenience. Vasubandhu's reply asks why, if karma can already produce such lifelike matter out of nothing, one more step should be needed at all.
若爾，應許彼那落迦業增上力生異大種，起勝形顯量力差別，於彼施設獄卒等名，為生彼怖，變現種種動手足等差別作用，如羝羊山乍離乍合、剛鐵林刺或低或昂。非事全無，然不應理。
In that case, it should be accepted that, through the power of hell-beings' own karma, distinctive great elements arise, giving rise to differences in superior form, color, size, and strength; on these, the names "hell-guardian" and the rest are provisionally applied. In order to produce terror in the condemned, these elements manifest various differentiated functions, such as the moving of hands and feet — as when the two ram-like mountains alternately part and close together, or the spikes of the iron forest bend down or rear up. It is not that the facts are entirely absent — but this explanation is still not reasonable.
頌曰：
「若許由業力， 有異大種生，
起如是轉變， 於識何不許？」
A verse:
"If you accept that, through the power of karma,
distinctive great elements can arise
and undergo such transformation —
then why not accept the very same, directly, of consciousness?"
論曰：何緣不許識由業力如是轉變，而執大種？
Why do you refuse to accept that consciousness itself, through the power of karma, undergoes such transformation — and instead insist on positing great elements external to it?
Kuījī reads this as Vasubandhu granting the Sarvāstivāda school almost everything, then taking the prize anyway. He does not dispute that karma can produce vivid, structured, moving phenomena that terrify and torment their target — that much, he says, "is not entirely absent." What he disputes is the unnecessary extra step: once you admit karma alone is powerful enough to conjure a formed, moving illusion of a tormentor, positing that this transformation happens directly within consciousness explains every observed fact, while positing it happens in some further, external "great element" explains nothing more and adds an entity too many.
7. Or a Habituation Left Somewhere Else?
The Sautrāntika school's rescue tries to have it both ways: karma's habituation is planted within the consciousness-stream itself, exactly as the Yogācārin says — yet the resulting fruit, they insist, still manifests as something external. Vasubandhu's closing move in Part One asks the same question again, now sharpened to a point: if you have already conceded where the seed is planted, what possible reason remains for insisting the fruit ripens somewhere else?
執那落迦由自業力生差別大種，起形等轉變，彼業熏習理應許在識相續中，不在餘處。
[The Sautrāntika] holds: hell-beings, through the power of their own karma, give rise to distinctive great elements, which undergo transformations such as taking on form. But the habituation left by that karma should reasonably be accepted as residing within the continuum of consciousness itself — not anywhere else.
頌曰：
「業熏習餘處， 執餘處有果，
所熏識有果， 不許有何因？」
A verse:
"You place karma's habituation in one place,
yet claim its fruit arises somewhere else;
the very consciousness that received the habituation could bear the fruit —
what reason is there to refuse this?"
論曰：有熏習識，汝便不許有果轉變；無熏習處，翻執有果，此有何因？
The very consciousness that carries the habituation — this you refuse to accept as undergoing the transformation into the fruit; yet the place where there is no habituation at all — this, on the contrary, you insist bears the fruit. What reason can there possibly be for this?
Kuījī treats this as the sharpest of the three refutations, because the Sautrāntika has already, unlike the Sarvāstivāda, conceded the site where karma's habituation is actually stored — the consciousness-stream itself, "pervading the three realms," in their own account. Having granted this much, insisting that the fruit must still ripen as something external becomes, in Kuījī's reading, simply arbitrary: the seed is here, the reasonable place for the sprout is here too, and no further reason is ever supplied for the fruit to jump anywhere else. With all three rival schools' rescues now closed off, the treatise's remaining question is what the Buddha actually meant by teaching, in scripture, that form and the other physical processes really do exist — which Part Two takes up directly.
Part One Complete
This closes Part One of Ru-Yi's translation: Vasubandhu's opening thesis that the three realms are consciousness-only, the fourfold challenge an opponent raises against it, and his answer — first through the separate similes of dream and hungry ghost, then through hell alone, and finally through the systematic refutation of three rival schools' accounts of who, or what, a hell-guardian could possibly be. Part Two turns to the Buddha's own scriptural teaching that form and the senses exist, and to the treatise's most famous argument: that no indivisible atom could ever combine with another to build the physical world at all.
Continue to Part 2 — Scripture's Hidden Intent, and the Refutation of Atoms →