I. What This Concept Is About
1. One Sentence and Its Skeleton
界攝 (dhātu-saṃgraha) literally means "to bring all dharmas into the fold of the *dhātu* system." The root meaning of 界 (dhātu) is "that which can hold, that which can sustain" — the underlying power that can bear, preserve, and perpetuate a given class of dharmas. 攝 (saṃgraha) means "to gather in, to encompass, to include." Taken together, the two characters name a deliberately teleological project of classification in the Yogācāra school: bringing material form, mind, defilement, purity, the body, the world, time, and ethics simultaneously into one unified *dhātu* system.
The fundamental direction of this project is stated plainly in the *Yogācārabhūmi-śāstra* (《瑜伽師地論》): 「一切皆為趣向涅槃，悉以涅槃為其後際，過此無復立界。」 — "All dharmas are directed toward nirvāṇa; nirvāṇa is their final terminus; beyond this, no further realm is established." (*"Everything converges on nirvāṇa; nirvāṇa is its final limit; past that point, no realm is set up any longer."*) Every classification exists so that dharmas may ultimately point toward liberation — and when classification is no longer needed, classification itself ceases. This is the single most important thing about dhātu-saṃgraha: it is not a neutral cognitive exercise but a labor with a destination.
2. A Three-Layered Skeleton: "Dhātu" Can Be Cut in Several Different Ways
Within dhātu-saṃgraha, *dhātu* admits at least three modes of cutting, and the three layers do not contradict one another.
Layer One: the eighteen dhātus — cut along the "six channels through which cognition occurs"
The structure of the eighteen dhātus (aṣṭādaśa-dhātu) is 6 × 3 = 18: eye-dhātu, form-dhātu, eye-consciousness-dhātu; ear-dhātu, sound-dhātu, ear-consciousness-dhātu; nose-dhātu, odor-dhātu, nose-consciousness-dhātu; tongue-dhātu, taste-dhātu, tongue-consciousness-dhātu; body-dhātu, touch-dhātu, body-consciousness-dhātu; mind-dhātu, dharma-dhātu, mind-consciousness-dhātu.
Why is each group a triad of "faculty — object — consciousness"? Because a complete act of cognition requires three things: the purified material base of the sense faculty (根, indriya), the object that is perceived (境, viṣaya), and the event in which the cognitive function discriminates by uniting faculty and object (識, vijñāna). If any of the three is missing, cognition does not occur.
The *Abhidharma-samuccaya-vyākhyā* (《雜集論》) states the significance of this layer plainly: "界義" is "攝持一切法差別義" — "the meaning of *dhātu* is the meaning of sustaining the distinctions of all dharmas." The faculty-dhātus sustain the meaning of enjoyment (enabling us to enjoy objects); the object-dhātus sustain the meaning of the basis of enjoyment (the object as that upon which enjoyment relies); the consciousness-dhātus sustain the meaning of cognizing enjoyment (the discriminating function of awareness). The single word "dhātu" already "holds" three things. This is why the three names "faculty — object — consciousness" are not idle words.
Layer Two: the six great elements — cut along the internal/external division of physical properties
The six dhātus of the second layer are not sensory but elemental: earth (solidity), water (moisture), fire (warmth), wind (motion), space (the voidness that allows mutual containment and passage), and consciousness (the cognizing nature that engages its objects).
The critical point is this pair: each is divided into internal and external.
- Internal earth-dhātu = the solidity within the body. Hair, body-hair, nails, teeth, skin, flesh, bones, sinews, vessels, organs, viscera, excrement, and so on — whatever in the body is hard and load-bearing. One important detail deserves attention: even "糞穢" (excrement) is counted within the internal earth-dhātu, on the basis of what Yogācāra terminology calls the "親附、執受" (adherence-and-appropriation) relation — whatever the body "adheres to and appropriates" (i.e., whatever the body regards as "mine") belongs to the internal. This "internal" is not anatomical "inside" but "what is recognized as 'my own.'" Tears, sweat, saliva, marrow, and urine are placed in the internal water-dhātu on the same relation. - External earth-dhātu = the solidity of the container world (bhājanaloka) — tiles, wood, stone, mountains, and so on. - Internal water-dhātu = the moisture within the body — tears, sweat, saliva, marrow, urine, and so on. - External water-dhātu = wells, springs, ponds, marshes, rivers, seas, and so on. - Internal fire-dhātu = the warmth within the body. - The external fire-dhātu, the internal and external wind-dhātus, the internal and external space-dhātus, and the internal and external consciousness-dhātus are established on the same "each divided into internal and external" principle. The source does not enumerate every material instance, but the framework is already in place.
Thus "material body + container world" are enclosed in a single system by the six internal dhātus and six external dhātus.
Layer Three: multiple sets of dhātus — cut into different series according to different aspects of practice
The richest and most easily overlooked layer: the same group of dharmas yields different "dhātus" depending on the angle from which you cut.
The *Yogācārabhūmi-śāstra* explicitly lists several sets:
- By the meaning of "external non-departure and departure," it establishes the three dhātus of desire, form, and formlessness (kāma/rūpa/ārūpya-dhātu). - By the meaning of "internal non-departure and departure," it establishes the three dhātus of form, formlessness, and cessation — another set of three, now oriented inward. - By difference in discourse on the three times, it establishes the three dhātus of past, future, and present. - By suffering-and-delusion being many, middling, or few, it establishes the three dhātus of inferior, middling, and excellent — where suffering and delusion are heaviest, the dhātu is inferior; where lightest, excellent. - By difference in cultivating the wholesome, it establishes the three dhātus of wholesome, unwholesome, and indeterminate. - By the relation of deficient bonds, no bonds, and complete bonds, it establishes the three dhātus of one in training, one beyond training, and neither in nor beyond training (śaikṣa/aśaikṣa/naiva-śaikṣa-nāśaikṣa). - By the common and the uncommon, it establishes the two dhātus of with outflows and without outflows (sāsrava/anāsrava). - By the mundane and supramundane, the permanent and impermanent, it establishes the two dhātus of conditioned and unconditioned (saṃskṛta/asaṃskṛta).
Taken together, the point is clear: dhātu-saṃgraha does not hand you a list of dead terms; it teaches you the engineering method of "cutting the same thing from multiple angles according to different aims." Cut from the sensory angle, you get eighteen dhātus; from the material angle, the six great elements; from the ladder of defilement and purification, desire/form/formlessness; from immediate ethics, wholesome/unwholesome/indeterminate; from the progress of liberation, one-in-training/one-beyond-training/neither... Each set is one way of cutting a "dhātu."
The affiliation of the eighteen dhātus within the three realms is further refined: 「四唯欲界繫，十一通欲色界繫，三通三界繫」 — "four are bound to the desire realm alone, eleven are bound to both the desire and form realms, and three are bound to all three realms." (*"Four are exclusively desire-realm-bound; eleven span the desire and form realms; three span all three realms."*) The same item often "dwells in multiple realms at once." Finally there is a distinctive formulation — 「種種界、非一界、無量界」 — "various dhātus, not a single dhātu, measureless dhātus" — and the Buddha is cited in the 惡叉聚喻 (the aṣṭākṣa-fruit-cluster simile) as saying 「於諸界終不宣說界有邊際」 — "concerning the realms, one never declares that the realms have a boundary." (*"Of the dhātus, one never proclaims that the dhātus come to an end."*) This is an Indian medicinal fruit that grows in long clusters, used here as a metaphor for the unbroken succession between dhātus — they can be separated, but one never reaches "this is the last cluster."
3. Layered Volumes of the Same Object — the Eye's "One, Seven, Ten"
The depth of dhātu-saṃgraha also lies here: it lets you see that the same thing has different volumes under different cuts.
The *Yogācārabhūmi-śāstra* gives the example of the eye:
- By characteristic inclusion (相攝), looking only at the purified material base on which eye-consciousness depends — one item. - By inclusion of what is not separated (不相離攝), adding what is inseparable from it — seven items. - If all are taken by dhātu inclusion (皆據界攝), adding the water, fire, and wind dhātus within that eye — ten items (the previous seven plus water + fire + wind).
The same "eye" — how many items it counts as depends on which aim you are pursuing. All three numbers are correct: the first answers "on which purified material base does eye-consciousness arise?"; the second answers "how many parts must be assembled for the eye to function as an instrument?"; the third answers "what is the full picture of the eye as a bodily site composed of the six great physical elements?"
The crucial point here is "one and ten do not contradict" — the same object admits multiple layers of decomposition, depending on the question you are asking. This is how dhātu-saṃgraha's multiple dimensions coexist.
4. The *Abhidharma-samuccaya-vyākhyā*'s Alternative Positioning: Seeds, That Which Includes, What Is Produced
The above is the "grand map" of the *Yogācārabhūmi-śāstra*. The *Abhidharma-samuccaya-vyākhyā* (《雜集論》), by contrast, brings "dhātu inclusion" down to the level of a terminological operation: it lists dhātu inclusion as one of the eleven inclusion-gates (alongside characteristic inclusion, kind inclusion, stage inclusion, companion inclusion, direction inclusion, time inclusion, partial inclusion, complete inclusion, mutual inclusion, and ultimate-meaning inclusion). In this usage, dhātu inclusion refers specifically to: all the seeds of the aggregates, dhātus, and sense-bases are held by the ālaya-vijñāna (阿賴耶識) — because those seeds reside within the ālaya-vijñāna.
Around this central pivot, the *Vyākhyā* unfolds several compact families of terms:
- Mutual inclusion (更互攝): the aggregates, dhātus, and sense-bases intersect with one another — the form-aggregate contains ten material faculties and a portion of one material object; the consciousness-aggregate contains the seven consciousness-dhātus. Conversely, the ten material dhātus (eye and so on) each contain a portion of the form-aggregate; the mind-dhātu contains the consciousness-aggregate; the dharma-dhātu contains the feeling, conception, and volition aggregates in full, plus a portion of the form-aggregate. The containing is never one-to-one; it is a back-and-forth nesting of "full portion + partial portion." - Partial inclusion / complete inclusion (一分攝 / 具分攝): distinguishes whether a given item includes much or little. For example, the three mental factors of desire, aversion, and harm include only one portion of the dharma-dhātu (very little) — this is partial inclusion; the desire realm can include all eighteen dhātus in full — this is complete inclusion. - All eleven inclusions rest on brief collection inclusion (略集攝). The original text uses a directly accessible simile: 「猶如大海攝受眾流，色受等蘊攝受眼耳等諸法亦復如是」 — "Just as the great ocean receives all rivers, so the aggregates of form, feeling, and so on receive the dharmas such as eye and ear." (*"As the ocean gathers in all streams, so the aggregates of form, feeling, etc. gather in the dharmas of eye, ear, and so forth."*)
If you have an intuitive grasp of modern AI, one analogy may help: the so-called *latent space* in contemporary generative models — the "seeds that can generate images" stored internally, invisible from outside, which must first pass through "generation" to produce perceivable output. The idea of "seeds stored in the ālaya-vijñāna, held by the ālaya-vijñāna" has a faint, distant resemblance to this. But note a boundary carefully — this is only the finger pointing at the moon (指月之指). The AI latent space is a statistical, mathematical compression, with no observer; the "seeds held by the ālaya-vijñāna," by contrast, carry a direction of defilement and purity, and have a sentient being as their bearer. Moreover, the question "does this seed change or not when observed" leads in very different directions in AI and in Buddhist doctrine. A distant resemblance must not be pulled into synonymy.
5. A Comparison of the Two Paths
Both treatises belong to the Yogācāra division, but their emphasis in "dhātu inclusion" differs:
- The *Yogācārabhūmi* line: treats dhātu inclusion as a multi-layered, multi-angled system of Dharma-doors — the eighteen dhātus, the six great elements divided internally and externally, and multiple sets of cuts from defilement to purity. Everything converges on the destination of "directed toward nirvāṇa; past that point, no realm is established." - The *Abhidharma-samuccaya-vyākhyā* line: treats dhātu inclusion as one section among the eleven inclusion-gates — emphasizing the relation between seeds and what they produce, explicitly making the ālaya-vijñāna the abode of seeds.
The two stand in the relation of general treatise to detailed treatise — first the *Yogācārabhūmi*'s "grand map," then the *Vyākhyā* breaking each detail into operable terminology.
6. Dhātu Inclusion and Its Nearest Neighbors
- Characteristic inclusion vs. dhātu inclusion: for the same eye, characteristic inclusion contains only the one purified material base that gives rise to eye-consciousness; dhātu inclusion can contain ten items. The difference between these two counts lets us see — what you cut, and by what standard you cut, changes the result. - Dhātu inclusion vs. kind inclusion (種類攝): kind inclusion gathers all eye-faculties, ear-faculties, and so on together by "characteristic inclusion of the same kind," on the basis of their shared meaning of "capable of sustaining enjoyment"; dhātu inclusion is more engineered, containing multiple sets of cuts. - Dhātu inclusion vs. mutual / partial / complete inclusion: these are finer operations under dhātu inclusion. - Dhātu inclusion vs. dependent-origination inclusion (緣起攝): the two do not conflict — 「諸有隨生何界何地，當知有支即此所攝」 — "whatever realm or ground one is born into, know that the limbs of existence are included therein." (*"Wherever one is born, in whatever realm and ground, the twelve limbs [of dependent origination] are included therein."*) Dhātu inclusion governs classification; dependent-origination inclusion governs causality. - Dhātu inclusion vs. nirvāṇa: the ultimate presence of dhātu inclusion is in nirvāṇa — past that point, no realm is established.
II. Walking Through It in Daily Life
Dhātu inclusion sounds like an abstract system; in fact, contemporary people use parts of it almost every second. Let me walk through a day with you.
1. Two Minutes After Waking — the Six Internal Dhātus Are Immediately Complete
You wake; the first move is being dragged up by the alarm. Notice what your body has done:
Internal earth-dhātu is already present — teeth, bones, fingernails and toenails, spine, skin and flesh, every load-bearing solidity. Internal fire-dhātu is simultaneous — the body's warmth, the metabolism burning last night's blood sugar. Internal water-dhātu is awake too — a sticky mouth, saliva under the tongue, moist eye sockets, water vapor in the nasal passages. Internal wind-dhātu moves first — breath in and out, the diaphragm pushing and pulling, the intestines peristalsing; the body's "mobility" is its doing. Internal space-dhātu — the cavities of mouth, nose, alveoli, and the interstices between cells; the voidness that can hold other things has been there from the start. Internal consciousness-dhātu — you already know "I am awake." That "knowing" is consciousness.
The six external dhātus are also running simultaneously (the source text lists internal earth, internal water, external earth, and external water in detail; the rest follow the same "each divided into internal and external" principle):
External earth-dhātu — the bed, the wall, the floor: solid support. External water-dhātu — last night's water glass, the humidity in the air. External fire-dhātu — the heat of the radiator or the blanket. External wind-dhātu — the air conditioner, the morning breeze outside. External space-dhātu — the bedroom space that lets you lie stretched out. External consciousness-dhātu needs finer handling: consciousness's engagement with external objects usually proceeds through the first five sense-objects.
So six internal dhātus as one set (your material body) and six external dhātus as one set (your container world) completely cover you at this moment.
Where one easily goes wrong: many people narrow "earth, water, fire, wind, space, consciousness" down to "these five in the body + consciousness," ignoring the equal weight of the container world. In dhātu inclusion, the room and the body are equal objects of contemplation — your anxiety on the road comes not only from your heartbeat but also from the crowding of the street, the congestion of the crowd, the press of sound — all of that belongs to the six "external" dhātus.
2. On the Commute — All Eighteen Dhātus in Motion
On the train, every second, six pairs of sense channels fire densely:
- Eye-dhātu + form-dhātu + eye-consciousness: the phone screen, the carriage lights, the face of the passenger beside you... every frame is one arising-and-perishing of a "faculty—object—consciousness" triad. - Ear-dhātu + sound-dhātu + ear-consciousness: the station announcement, the video beside you, the music in your earbuds. - Nose-dhātu + odor-dhātu + nose-consciousness: leftover breakfast scent, perfume, the disinfectant smell of the carriage. - Tongue-dhātu + taste-dhātu + tongue-consciousness: the residue of this morning's coffee in your mouth. - Body-dhātu + touch-dhātu + body-consciousness: the pressure of the backpack strap, the weight on the soles of your feet as you stand, the touch of being jostled. - Mind-dhātu + dharma-dhātu + mind-consciousness: rocking with the train, scrolling the news, thinking about the afternoon meeting.
The eighteen dhātus are triads running simultaneously; not one of the three can be missing. You think you are "scrolling your phone"; in fact six faculties, six objects, and six consciousnesses are at the same time arising and perishing densely across those ninety seconds. This is why the eighteen dhātus are not a noun list but a real operation.
Where one easily goes wrong: contemporary people say "I see with my eyes," "I think with my mind" — this way of cutting forces the triad back into two items or one. Dhātu inclusion does not see it that way: cognition is always the synthesis of faculty—object—consciousness. You think you have omitted the other two; the omitted two are still doing their work.
3. Ten Minutes of Overtime — Three Cuts Running in Parallel
In the ten minutes when you get up to pour water, three frameworks can be applied simultaneously:
Cut A — the eighteen dhātus: as you stand, the tactile sense of the body (body-touch), the workstation seen by the eyes (form-object), the unsettled matters in consciousness (dharma-object) — a triad moving through the moment.
Cut B — the multiple sets of dhātus: - From external non-departure/departure: this is the desire realm (kāma-dhātu) — a situation pulled by the senses, not yet the purity of the form or formless realms. - From suffering-and-delusion being many/middling/few: the present irritation can be classed as "inferior" — the bracket with much suffering and much delusion. - From the cultivation of the wholesome: getting up to pour water is "indeterminate" (a neutral act without good or evil, defilement or purity); if you silently wish "may I be focused and of use to everyone," that is wholesome.
Cut C — partial inclusion / complete inclusion: the little bit of irritation in your mind, in the *Vyākhyā*'s terminology, includes only one portion of the dharma-dhātu; while the world you occupy at this moment (office, keyboard, lights, air) is the completely inclusive desire realm, able to include all eighteen dhātus. So at the same time, the irritation in your mind is a small part, and the realm you inhabit is a vast totality.
Where one easily goes wrong: taking "this is an emotional problem" as the whole explanation. Dhātu inclusion says: this emotion of yours (a small part) is never isolated — the entire desire realm you are in right now (crowding, pressure, unresolved matters) jointly constitutes that complete inclusion. The emotion should be contemplated together with the environment.
4. In an Intimate Relationship — the Multiple Realms in a Few Sentences of Dialogue
At the dinner table, your partner suddenly says: "Do you think it's easy for me to get a word in with you?"
- From desire / form / formlessness: this moment is a situation driven by desire, habit, and dependency. - From wholesome / unwholesome / indeterminate: your next reply may be wholesome (patience, listening), unwholesome (anger, retaliation), or indeterminate (a perfunctory brush-off). - From one in training / one beyond training / neither: can you detect your own reaction pattern within this sentence? If you can, at that moment you are "one in training" — still learning; if you are already not dragged along by the thought, that is a moment of "one beyond training"; if you are exhausted and numb, you have fallen into "neither." - From with outflows / without outflows: you have not yet stepped out of the self-centered filter, so this sentence stirs a ripple — it is with outflows.
The same sentence, cut from different angles of dhātu inclusion, can simultaneously diagnose several layers of condition, and they do not conflict. This is precisely the engineering character of dhātu inclusion: it does not force you to look at one thing from only one angle. The greatest tragedy in intimate relationships is looking from a single angle — "are you good to me," "whose fault is it this time" — while dhātu inclusion gives you eight or ten dimensions that can be activated at once.
Where one easily goes wrong: narrowing "dhātu" down to "the six realms of rebirth." Desire / form / formlessness is not only the question of where you go after death; it is the density in which your consciousness is resting right now. A dinner table where you are silently fuming can fall directly into the "desire realm" bracket — no need to wait for death.
5. Parenting, Anxiety Loops
The child has been crying for hours; you soothe, check the formula, take the temperature — this is a rapid switching across many dhātus:
The six-dhātu diagnosis: the child cries — his internal earth-dhātu is tensing (clenched fists, tight face), internal fire-dhātu is running high (flushed face), internal water-dhātu (tears), internal wind-dhātu (rapid breathing), internal space-dhātu (the chest cavity struggling to draw air), internal consciousness-dhātu (the suffering he can feel). At the same moment, you take over and protect from the angle of the six external dhātus — the temperature, humidity, air, the texture of the blanket, the wateriness of the formula — all helping you respond.
The eighteen-dhātu angle: the child is expressing to you in a language not yet mature — searching through body-touch and sound-objects, and in the dharma-objects of consciousness, trying to find "a sign that can be comforted."
The multiple-sets angle: your relationship with the child has pulled your state into the one-in-training class — you are learning something you must learn.
6. The Few Minutes of Quiet — Moving Toward "No Realm Beyond"
At night you close the book, turn the phone face down, and for a few minutes think nothing.
- From the eighteen dhātus: the six faculties settle; form, sound, smell, taste, touch, and dharma have no strong objects striking them. - From the multiple sets: at this moment you have loosened out of the intensity of the desire realm — no need to leap to the form or formless realms, but the density has dropped. - From that end-point sentence: 「過此無復立界」 — "past this point, no realm is established." (*"Beyond this, no dhātu is set up any longer."*) When you are truly settled, all concepts like "dhātu" are suspended. The mind is no longer classifying, no longer comparing, no longer storing — it is just itself. This is the end of dhātu inclusion: classification ceases in the stillness of consciousness.
III. Why Contemporary People Need It
The contemporary mind is drowned in classifications: MBTI, the Enneagram, personality colors, four blood types, family-of-origin models, attachment styles, depression inventories, anxiety inventories, stage theories, checklist methods, atomic habits... every few years a new classification appears. We are always looking for some one classification that will solve "what exactly is wrong with me."
The problem is that most of these classifications are single-angle. MBTI cuts personality preferences; attachment theory cuts relationship patterns. Each gets one part right, but none tells you "what major categories the world is made of." And their end point is usually "understanding oneself" — stopping at understanding, not pointing toward actually letting go.
Dhātu inclusion offers another approach — a grid of classifications that are parallel, stackable, and strung together by a single word:
First, it cuts "the entirety of what is cognized," not just "me" — the material body, the container world, the cognitive system, defilement and purity, space-time, ethics: all gathered under the one word "dhātu." This gives you a true wide-angle view.
Second, its multiple cuts exist simultaneously — cut from the senses, you get the eighteen dhātus; cut from material texture, the six great elements; cut from the position of practice, desire/form/formless; cut from immediate ethics, wholesome/unwholesome/indeterminate. This set of cuts cultivates in your mind a capacity: multi-dimensional parallel diagnosis at the same time, not hypnotized by any single facet.
Third, its direction is determinate — all cuts move toward "directed to nirvāṇa." This means the classification is not "understanding oneself" and then stopping at understanding, but "seeing and letting go." Few contemporary classification systems can do this.
Fourth, it places the environment and the body on equal footing as objects of observation — anxiety is not only in the brain; the clutter of furniture, the stuffiness of the air, the tensions of the community, the pace of the city, the notification rhythm of the screen — all are within the six external dhātus. Dhātu inclusion from the start blocks the inward-turning "everything is internal" reflex.
Fifth, it helps you see "the layered volume of the same object" — the eye example reminds us: the same eye can be one item, seven items, ten items. This trains you not to know yourself by a single number. "I did well/badly today" is a single-value judgment; "today, from the sensory angle I accomplished it, from the ethical angle it is not yet pure, from the progress of practice I am already learning" — that is the format of dhātu inclusion.
So what dhātu inclusion gives contemporary people is not another psychological scale, but a syntax of classification that can both gather in all dharmas and always point toward purity. In a present age perpetually refreshed by algorithms and psychological tests, it still has engineering depth.
IV. Common Misreadings and Clarifications
Misreading 1: "Dhātu" just means "element." Reading dhātu inclusion as "the Buddhist version of the five-element / six-element theory" often narrows the internal earth-dhātu down to "bones."
Clarification: the internal earth-dhātu includes "hair, body-hair, nails, teeth, skin, flesh, bones, sinews, vessels, organs, viscera, excrement" — whatever has solidity in the body counts, not just bones. The more central meaning of "dhātu" is "that which can hold" — the underlying capacity to preserve and sustain, not merely a classification of matter. Translating it baldly as "element" loses that core of "holding"; perhaps closer would be words like *dimension* or *substrate* — the underlying dimension that can bear a class of dharmas.
Misreading 2: Dhātu inclusion = the eighteen dhātus. Many readers, on hearing "dhātu inclusion," immediately equate it with the eighteen dhātus.
Clarification: the eighteen dhātus are only one important cut within dhātu inclusion. The *Yogācārabhūmi* also explicitly teaches the internal/external division of the six great elements and the multiple sets of "many kinds of dhātus"; the *Abhidharma-samuccaya-vyākhyā* teaches mutual inclusion, partial inclusion, complete inclusion, and so on beyond the eighteen dhātus. The eighteen dhātus are like one vertical thread in a large net; they cannot stand in for the whole net.
Misreading 3: "Dhātu" means the desire realm / form realm / formless realm (three living spaces). This is the popularized version of the word "three realms." Many people think "dhātu" means "some living space within saṃsāra."
Clarification: in dhātu inclusion, "the three dhātus of desire/form/formless" is only one set among the multiple sets — "by the meaning of external non-departure and departure, the three dhātus of desire, form, and formlessness are established." Besides this, there is another set of three — "by the meaning of internal non-departure and departure, the three dhātus of form, formlessness, and cessation"; the three dhātus of wholesome/unwholesome/indeterminate; the three dhātus of one-in-training/one-beyond-training/neither... The word "dhātu" in dhātu inclusion is a general term for classification — it can be cut in different angles according to different aims, and does not refer exclusively to any one fixed set of "three realms."
Misreading 4: Dhātu inclusion is only epistemology, about "how to see." A reader may think this is only about "how to analyze things."
Clarification: dhātu inclusion is epistemology, theory of matter, theory of practice, and theory of liberation fused into one. It contains the six great elements of the material body; the corresponding six dhātus of the container world; the eighteen-dhātu mechanism of cognition; the multiple sets of dhātus from defilement to purity; and finally the direction of "directed toward nirvāṇa; past that point, no realm is established." It teaches you how to classify, but every classification points to how to let go.
**Misreading 5: Taking the *Vyākhyā*'s "dhātu inclusion = seeds held by the ālaya-vijñāna" as the only meaning.** Admittedly this is one clearly specified technical usage among the *Vyākhyā*'s eleven inclusion-gates. But the *Yogācārabhūmi*'s "dhātu inclusion" is far broader and is not necessarily tied to the ālaya-vijñāna. If one speaks only of seeds and the ālaya-vijñāna, one loses the rich Dharma-doors of "the multiple sets of dhātus," "the internal/external division of the six dhātus," and "the multiple volumes of the eighteen dhātus."
Misreading 6: Treating dhātu inclusion as a "Buddhist classification dictionary." It is not a dead list of terms. "The multiple sets of dhātus" tells us plainly: the kinds of classification depend on your purpose. If you want to handle "immediate ethics," cut wholesome/unwholesome/indeterminate; if you want to handle "progress of liberation," cut one-in-training/one-beyond-training/neither. Dhātu inclusion is called a "Dharma-door" precisely because what it brings out is flexible cutting, not a rigid glossary.
Misreading 7: Modern AI / neuroscience can "prove" dhātu inclusion. In some conversations, people try to use brain science, neuroplasticity, or machine learning to "corroborate" the reasonableness of the Buddhist dhātu inclusion.
Clarification: such analogies can serve as the finger pointing at the moon, reminding us that this world does indeed have multi-layered, multi-dimensional, stackable complex structure. But science does not prove Buddhism. On the one hand, neuroscience cannot yet give a complete account of subjective experience (the so-called *hard problem* in consciousness studies); on the other hand, the end point of dhātu inclusion — nirvāṇa, liberation — is simply not within the domain of empirical science. Reducing dhātu inclusion to "a big classification system" loses its most central direction.
*A note: this essay takes as its primary material the "dhātu inclusion" entries provided by the Yogācārabhūmi-śāstra and the Mahāyānābhidharma-samuccaya-vyākhyā. The Buddhist tradition's discussion of the eighteen dhātus is rich in the early Āgamas, and the Abhidharmakośa and Satyasiddhi-śāstra also systematize it; however, this essay draws only on the provided material and the author's own understanding, without any online retrieval. The classical quotations cited here all come from the passages marked in those two treatises (not replaced by quotations from other scriptures); where the material is silent (such as which specific dhātus among the eighteen are bound to which realm, or the detailed particulars of the external six dhātus apart from earth and water), the essay has cautiously refrained from specific claims and has made no fictional filling. Where modern analogies are involved, their limitations have been noted in place.*