这个概念在说什么
If you have ever read Buddhist texts and felt that the same Chinese word seems to mean opposite things in different places, "常法" is one of the clearest examples of why that happens. The same two characters — "常法," literally "permanent dharma" or "constant dharma" — show up across Buddhist literature pointing in three quite different directions. Until you see how the three are held together, the word will keep tripping you up.
The word itself: 常 (cháng) means "constant, unchanging, perpetual," and 法 (fǎ) here means "thing, phenomenon, law, teaching" — the broadest possible term in Buddhist philosophy. So at its surface, 常法 is "a thing (or law) that is constant." What kind of "thing," and what kind of "constant," depends entirely on which text you are reading and what is being argued. Let me walk through the three faces one by one, because they are not contradictory — they are three slices of the same problem Buddhism has been working on for two and a half millennia: how do we speak truthfully about what lasts and what does not?
Face 1: 常法 as the "Fixed Track" of a Buddha's Life (常轨之义)
In the *Dīrghāgama* (《长阿含经》), 常法 refers to the fixed narrative track by which every Buddha comes into the world. This is what we might call the "regularity" meaning, and it shows up as the term 诸佛常法 — "the 常法 of all Buddhas."
The text sets up the moment carefully. The Buddha says, "Now I wish to speak, by means of the knowledge of past lives, of the affairs of past Buddhas." Then it enumerates eight things that always happen when a Bodhisattva descends, is born, and begins his path — eight items, each closed with the refrain "此是常法" — "this is the 常法":
1. The Bodhisattva descends from the Tuṣita Heaven (兜率天) into his mother's womb, enters from her right side, with undistracted right mindfulness; the earth shakes; great light fills the world, illuminating even the places the sun and moon cannot reach, the dark places, the demon palaces, and the heavens. 2. While in the womb he remains undistracted; four heavenly beings stand guard with spears, so that no human or non-human can disturb him. 3. His mother holds the five precepts, lives in purity, deep in faith and loving-kindness; when her life ends she is reborn in the Trāyastriṃśa Heaven. 4. At birth he emerges from her right side; the earth shakes; great light shines; the very darkness that existed at his conception is illuminated. 5. At birth his mother grasps a tree branch, neither sitting nor lying; four heavenly beings bring her fragrant water and say, "Heavenly mother, a holy son is born, do not grieve". 6. At birth his body is unstained by filth — "like a bright pearl placed on white cloth, the two do not stain each other". 7. At birth he takes seven steps upon the ground, surveys the four directions unaided, raises his hand and declares: "Above the heavens and below, I alone am honored; I shall save sentient beings from birth, old age, sickness, and death". 8. At birth two springs arise, one warm and one cool, for his bathing.
Each item is followed by a verse ("佛时颂曰") that retells it, giving the section its regular long-prose-then-verse rhythm.
This 常法 is not a metaphysical claim about the universe. It is closer to what we'd call a literary-narrative convention — the fixed storyline by which a Buddha's birth is depicted in scripture. The word "constant" here means "this is the way it always happens," not "this is an eternal essence." Every line is closed with "此是常法" the way a legal code is closed with "such is the established rule." The point is: this is the pattern; every Buddha follows it.
Face 2: 常法 as the Wrong View of Permanence (常见之义) — to be Refuted
In the *same* Dīrghāgama, almost in the same breath, 常法 shows up meaning the opposite thing — a wrong view held by non-Buddhist ascetics. Here is the contrast made plain.
Various śramaṇas and brāhmaṇas, based on meditative absorption (三昧), recall past cosmic cycles (成劫, the "forming kalpas") and future cycles (败劫, the "dissolving kalpas"). On the basis of what they remember, they fall into the view "this world is permanently existent; this alone is true; everything else is false" (世间常存，此为真实，余者虚妄). The text then categorizes this error into three grades by how much cosmic history the meditator can recall:
- 初常法 (the first 常法): one who recollects twenty forming and dissolving kalpas. - 二常法 (the second 常法): one who recollects forty. - 三常存法 (the third 常存法): one who recollects eighty.
The more you can remember through deep meditative states, the more elaborate your permanent-world theory becomes — but it is still a 常法, a "permanent-dharma" view. The Buddha is said to transcend all three.
Here 常法 is something to be overcome, not affirmed. The word's meaning is now "the wrong view that things are permanent."
Face 3: 常法 as the True Permanence of the Tathāgata (常住之义) — to be Affirmed
In the *Mahāparinirvāṇa Sūtra* (《大般涅槃经》), the term flips again, but now in a strongly affirmative direction. Here 常法 means "that which truly is permanent, unchanging, unconditioned" — and it is reserved for the deepest things: 如来 (the Tathāgata), 佛性 (Buddha-nature), 法 (Dharma), 僧 (Saṅgha), and 无为法 (the unconditioned).
The text is doing something careful here. It builds a chain of technical terms so the reader cannot mistake what kind of "permanence" is meant:
- 常住法 — the "permanent-abiding dharma" - 不变易法 / 不变异法 — the "un-changing-and-not-altering dharma" - 无为法 — the "un-conditioned dharma" (not produced by causes and conditions) - 涅槃 — nirvāṇa itself
These four are linked into a single equivalence chain: "佛性即是如来，如来即是法，法即是常；常者即是如来" — "Buddha-nature is the Tathāgata, the Tathāgata is the Dharma, the Dharma is the 常; the 常 is the Tathāgata." And: "如来—无为—常—法—僧" are all mutually linked.
This 常法 is what is left when everything that arises from causes and conditions (有为之法) is stripped away. The text is explicit about the dividing line: "从因生法，不名为常" — "a dharma produced from causes is not called permanent." Only what is un-produced, un-decaying, without coming and going, beyond past/present/future, and not contained in the five aggregates (阴), eighteen senses (界), twelve sense-bases (入) is 常.
It then deals with a hard objection: if nirvāṇa is just the cessation of afflictions, with nothing left over, how can it be called "permanent and unchanging"? Isn't that just one step away from saying nirvāṇa is annihilation (断灭)? The text responds: nirvāṇa is not nothingness. The Tathāgata is declared 常法 precisely because even when he appears to enter nirvāṇa, he is not truly extinguished. His displayed body is a 变化身 (transformation body), not a 杂食身 (a body sustained by ordinary food). Birth, eating, sleep, illness in his story are "conforming to worldly convention" (随顺世法) — skillful displays, not signs of conditioned existence.
This 常法 is the most ambitious positive use of the term. And it is the source of the famous 涅槃四德 — the "four qualities of nirvāṇa" — 常 (permanent), 乐 (bliss), 我 (self), 净 (pure). These are the corrected versions of the four inversions (四颠倒) that ordinary beings suffer under: 无常 (impermanent), 无乐 (without bliss), 无我 (without self), 无净 (impure). The 常 in "常乐我净" is exactly this 常法.
Face 4: 常法 as What Nāgārjuna Refutes (遮遣之义)
In Nāgārjuna's *Mūlamadhyamakakārikā* (《中论》) with the commentary by Piṅgala (青目释), 常法 is treated as something to be dismantled by analysis, not affirmed. The strategy is sharp: bind 常 together with 定性 (fixed nature) and 实有 (real existence), then show that dependent origination (缘起) and lack of self-nature (无自性) leave no room for any of them.
The definitions are made explicit: - "若法有定性，非无则是常；先有而今无，是则为断灭" — "If a dharma has fixed nature, then, unless it does not exist, it is permanent; if it first exists and later does not, then it is annihilation." - "若法定有有相，则终无无相，是即为常" — "If a dharma has fixed existence-with-characteristics, then it never has no-characteristics; this is permanent." - "若法实有性，后则不应异" — "If a dharma has real existence, it should not later become different."
From these, the text identifies two common shapes of the 常 view: a dharma that, while moving through past–present–future, never "lets go of its original character"; or the view that the effect is already present in the cause ("因中先有果"). Both are 常 in the sense of 定性 — fixed nature that does not alter.
The argument then bites in two directions:
First, 常 and 断 (permanence and annihilation) are paired as the two horns of a dilemma: any "received dharma" (所受法) you try to grasp with a fixed view either becomes permanent (常边) or becomes annihilated (断边). The middle way is: "因果相续故，不断亦不常" — "Because causes and effects are in continuity, there is neither cessation nor permanence." The way through is not to find a third thing in between but to see that the dilemma itself was built on the assumption of fixed nature.
Second, a truly 常 dharma would be unredeemable: "若法实者则是常，常则不可增益" — "If a dharma truly exists, it is permanent; what is permanent cannot be increased." A permanent dharma cannot be cultivated or practiced toward; if everything were already permanent, there would be no path of practice. This is decisive in the Buddhist context, because Buddhism is a path. If everything were 常法, there would be nothing to do.
Piṅgala's commentary on nirvāṇa is the final twist: "虽常法假名无为，以理推之，无常法尚无有，何况常法不可见不可得者" — "Although the 常 dharma is provisionally named 'unconditioned,' when reasoned through, even impermanent dharmas cannot be grasped — how much less so the 常 dharma, which cannot be seen or obtained?" The 常 dharma is here explicitly marked as a provisional name (假名), not a real entity.
How the Three Faces Hang Together
So 常法 is a single word that does three jobs:
- Face 1 (Dīrghāgama, narrative): the regular track — a literary convention describing how every Buddha is born. - Face 2 (Dīrghāgama, refuted view): the wrong view of permanence — held by meditators who mistake their deep memory of past cycles for proof that the world is permanent. - Face 3 (Mahāparinirvāṇa, affirmed truth): the true permanence of the Tathāgata, Buddha-nature, and nirvāṇa — unconditioned, not arising from causes. - Face 4 (Madhyamaka, dismantled view): the abstract concept of "permanent dharma" bound to fixed-nature and real-existence, dismantled by analysis of dependent origination.
The reason the same word covers so much ground is that Buddhist thought is constantly walking a tightrope between two errors: the error of saying things last forever in the wrong way (eternalism, 常边) and the error of saying nothing continues at all (nihilism, 断边). Different texts lean toward one or the other side of the wire depending on what error they are correcting at that moment.
In the *Dīrghāgama*, the audience of meditators needed to be warned off the 常 view. In the *Mahāparinirvāṇa Sūtra*, the audience of devotees who feared their teacher had simply died needed to be shown that there is something that does not die. In the *Madhyamaka*, the audience of sophisticated metaphysicians needed to be shown that even the notion of "real permanence" was a conceptual trap. The word 常法 threads through all three conversations.
生活里的走查
Now let us walk this word through a few ordinary contemporary scenes, because the three faces of 常法 actually show up in daily life, and you can feel them operating in yourself once you know what to look for.
Scene 1: The Breakup That "Proves People Don't Change"
Someone close to you has just ended a relationship — their own, or a friend's. The phrase that always comes up is "I knew it would end this way" or "people never change." Underneath that phrase is 常法 in Face 2: the view that people have a fixed nature that will always reassert itself. "He will always be like this." "She is fundamentally selfish." "I am fundamentally anxious." These statements feel like calm recognition of reality, but they are doing the work of Face 4 — they treat a person as having 定性, a fixed nature, an 实有 that cannot be altered. The 常 in these sentences is the 常 that Nāgārjuna dismantles.
In the same conversation, though, something else often shows up: "But who they really are, deep down, hasn't changed." That "deep down" — the sense of a real person underneath all the moods — is closer to Face 3, the 常 of Buddha-nature. It is a different 常 from "people never change." It is the sense of a stable witness, a continuity that does not break when circumstances break. Whether that sense is metaphysical truth or useful fiction is exactly the question the Buddhist tradition is divided on.
The everyday mistake is to smash the two 常s together: to take the 常 of "deep person" and use it to justify the 常 of "never changes." "I know who you really are, and this is it." That move turns a true insight into a weapon. The walk-through: catch yourself the next time you say "people don't change," and ask which 常 is at work. If it is Face 2's wrong 常, you are nailing a person to a fixed idea of them. If it is Face 3's true 常, you are recognizing something in them that does survive mood and circumstance — but that recognition does not need to deny change.
Scene 2: The Morning Routine That "Is Just How I Am"
You wake up at the same time every day, drink the same coffee, take the same route to work, sit in the same chair, eat the same lunch. The pattern is so stable it feels like part of your identity. When something disrupts it — travel, illness, a partner's needs — you feel vaguely off, and you say, "I just need to get back to my routine."
Here the 常法 of Face 1, the "fixed track," shows up. The morning routine is your 诸佛常法 — your personal narrative convention, the regular track by which your day reliably happens. This is not a metaphysical claim. It is just a pattern that has stabilized, and its stability has become part of how you know yourself.
The trap, however, is to mistake Face 1 for Face 3 — to mistake "I always do this" for "this is who I really am." The routine is a pattern. You are not the routine. The routine could change tomorrow if your circumstances changed, and the deeper witness of you would still be there. Conversely, if you say "I have no real me, I am just whatever pattern I happen to be in," you have slid into Face 4's nihilistic trap (断边) — denying any continuity at all.
The walk-through: when you notice yourself identifying with a pattern, ask, "Is this pattern the way it is because it has genuinely stabilized, or because I am clinging to it as if it were my essence?" The first response is mature engagement with reality. The second is the 常 of Face 2 — making a contingent pattern into a metaphysical permanent.
Scene 3: The Buddhist Who Wants a "Real Self" and the Buddhist Who Wants "No Self"
In contemporary dharma circles you hear both these voices often. One practitioner says: "There is a real me underneath. Buddha-nature is who I really am. Meditation helps me contact this true self." Another practitioner says: "There is no self. All phenomena are empty of fixed nature. Don't grasp at any 'real you.'" Both are speaking within the Buddhist tradition, both are sincere, and they are both arguing about 常法.
The first voice is working inside the *Mahāparinirvāṇa Sūtra*'s framework. For them, 常法 is Face 3 — true permanence, the unconditioned, what does not arise or pass. They read the 常 of 常乐我净 (the 常 in the four qualities of nirvāṇa) as an affirmation of a real, abiding, unconditioned self — though careful Tathāgatagarbha texts usually stress that this "self" is not the ordinary self.
The second voice is working inside Nāgārjuna's framework. For them, 常法 is what gets dismantled by analysis. To them, "Buddha-nature as a real permanent thing I can contact" is exactly the 常 that dependent origination will not allow.
Both voices have classical texts behind them. The walk-through: if you are sitting in meditation and you feel an urge to grasp at "the witness behind everything" as a permanent self — note that urge. It might be pointing to something real. It might also be the 常 of Face 2 — a view that mistakes a stable psychological function for an eternal essence. The question is not which side is right. The question is what happens to the urge when you look at it closely: does it relax into something ungraspable, or does it solidify into a thing?
Scene 4: The Office Politics of "That's Just How She Is"
In meetings, someone says: "Don't bother pushing back on her — that's just how she is. She has always been like this. She will always be like this." This is 常法 in its most insidious everyday form. The 常 being invoked here is "fixed character" — a 常 that legitimates giving up on change, on feedback, on growth. It is the 常 of Face 2, dressed in the language of Face 3.
The Face 3 reading would say: "There is something in her that does not change — but that something is not the surface behavior. The behavior is conditioned (有为, from causes). The witnessing awareness beneath might be stable, but the surface pattern can absolutely shift when conditions shift."
So when you catch yourself or others saying "that's just how she is," it is worth pausing. The 常 you are pointing at may be real — but if it freezes you out of relating to the person as a process that can respond, you are using 常 as a kind of resignation, not as wisdom.
Scene 5: Grief, and the Question of What Continues
When someone we love dies, two impulses pull us in opposite directions, and both are about 常法.
The first impulse says: "They are gone. They will never come back. There is nothing left." This is 断 (annihilation) — the opposite of 常. Many grief traditions rightly speak against this 断 view, because it cuts off the relationship before the heart has finished with it.
The second impulse says: "They are not really gone. They live on in me, in heaven, in some other realm. They are permanent." This is closer to Face 3's 常, but it can easily slip into Face 2's 常 — into the abstract view "they exist somewhere as a permanent substance."
The mature Buddhist move (which you can find in the *Mahāparinirvāṇa Sūtra* and elsewhere) is neither. It says: what we loved in them is not the conditioned form. The conditioned form is gone. But what was real in them — their capacity to love, their awareness, their unfabricated kindness — does not belong to the conditioned form alone. It does not die when the form dies. This is a 常, but not a 常 that you can locate in space or schedule a phone call to.
The walk-through: when grief brings up the question "what continues?", don't rush to answer it as either "nothing" or "everything continues exactly as it was." Sit with the question. Notice that the love itself is still operating in you. Notice that the operation of love does not depend on the other person being permanently located somewhere. Notice that the 常 being felt is not the 常 of a permanent soul floating in space — it is the 常 of a pattern of relating that is still alive in you and still has work to do.
Scene 6: The Algorithm That Says "You Will Always Like This"
Open any platform that recommends content. It has built a profile of you, and the profile is a 常 — a fixed-nature claim: "This is what you like. You will always like this." The profile is built from past behavior, so it is essentially an inference of 定性 (fixed nature) from observed pattern. From the *Madhyamaka* perspective, this is exactly the 常 view as a technical operation: take an observed regular pattern, treat it as fixed nature, use it to predict the future.
This is useful in many ways. It is also subtly flattening. The platform's "you" is Face 2's 常 — the 常 of fixed nature. Your actual preferences are conditioned, contingent, evolving. If you let the platform's "you" define your actual tastes, you are being gradually formed into a fixed-nature version of yourself, which is a small but real 常法 training every day.
The walk-through: every now and then, intentionally search for something the algorithm has not recommended to you. Notice whether your reaction to it is real interest or real disinterest. Notice that the algorithm's 常 of "you" is a model, not you. The moment you feel frustrated that the algorithm does not "know" you anymore, you are feeling the same edge the meditators in the *Dīrghāgama* were feeling when their deep-state memories of past kalpas made them think they knew the world was permanent.
当代人为什么需要它
Why bother with a term that means three different things at once? Because the three meanings are not a confusion — they are a precision tool. The contemporary self-help and mindfulness cultures have largely flattened this term into one of two extremes, and both extremes cause real harm. Knowing 常法 in its full classical range helps you avoid both.
The pressure to fix yourself (Face 2's 常, in disguise)
Modern psychology, branding, and identity discourse often quietly promote the idea that you have a fixed nature — "I am an introvert," "I am an empath," "I am a Type A," "I am a creative." These are sometimes helpful working labels. But they can harden, very quickly, into Face 2's 常 — into the conviction that you have a 定性 (fixed nature) that cannot change. Once you believe "I am fundamentally anxious" or "I am fundamentally broken," you have stopped treating your conditioning as conditioning. You have made it into your essence. This is exactly the 常 that the *Madhyamaka* texts are designed to dismantle — not because your traits are illusory, but because making them into a permanent thing you cannot alter takes them out of the realm where practice can work on them.
Knowing the *Madhyamaka* framing of 常法 gives you a precise way to say: "This trait is conditioned. It arises from causes. It can change when conditions change. I am not the trait." You don't have to deny the trait to say this. You just don't have to make it permanent. That move — refusing to nail yourself to a fixed-nature claim about yourself — is one of the most practically useful things the 常法 analysis gives you. It is also one of the most psychologically liberating: the gap between "I currently have anxiety" and "I am fundamentally an anxious person" turns out to be the entire space in which practice becomes possible.
The pressure to dissolve yourself (the mirror-image error)
The opposite error is just as current. Some streams of contemporary mindfulness discourse promote a thoroughgoing "no fixed self" view — sometimes presented as if it were the only authentic Buddhist position. But this view, taken alone, runs into the *Mahāparinirvāṇa Sūtra*'s deepest worry: if there is nothing at all that is permanent, then nirvāṇa is just the cessation of everything, which is annihilation (断灭), which is the other horn of the dilemma. Contemporary practitioners sometimes report that the "no self" teaching makes them feel not free but dissociated — unable to locate themselves at all, unable to take responsibility, unable to remember who they were yesterday in any meaningful continuity.
The 常法 of Face 3 — the *Mahāparinirvāṇa Sūtra*'s "true 常" — addresses this worry directly. It says there is something that does not arise and pass, that is not produced by causes, that is the witness of every changing state. You cannot see it, grasp it, or locate it in space. But it is not nothing. The 常乐我净 qualities — 常, 乐, 我, 净 — are the four inversions (四颠倒) of ordinary perception corrected. Most contemporary readers meet them as slogans; in the *Mahāparinirvāṇa Sūtra* they are doing serious work: they are saying that the ordinary perception of impermanence, suffering, no-self, and impurity is itself the inversion. The deeper perception sees 常 (permanent), 乐 (bliss), 我 (self), 净 (pure) — but in a register very different from ordinary permanence, ordinary bliss, ordinary self, ordinary purity.
Whether or not you take Face 3 as metaphysical truth, the practice it recommends is real: to look for the witness beneath the changing states, the awareness that does not itself flicker when its contents flicker. This is not a metaphysical claim you have to believe. It is a noticing you can do. And the *Madhyamaka* does not deny this noticing — it only refuses to let you reify it into a permanent thing.
The pressure to mistake pattern for essence (Face 2 in everyday life)
We are pattern-recognition animals. We look at our parents and recognize the patterns of our childhood in our own behavior. We look at our partners and recognize the patterns of every previous partner. We conclude "people are like this," "I am like this," "the world is like this." Each of these conclusions is the 常 of Face 2 — a 常 made by a mind that mistakes regular patterns for fixed natures.
Knowing the classical analysis of 常法 sharpens the question. When you notice yourself making a 常 claim about a person or situation, you can pause and ask: "Is this an inference from observed pattern, or am I treating the pattern as metaphysical essence? Is this a working hypothesis, or have I already decided nothing can change?" The distinction between "this person has reliably shown this trait" (a working hypothesis, still revisable) and "this person is fundamentally this" (a 定性 claim, Face 2's 常) is the entire difference between a flexible mind and a stuck one.
Why this matters now
We are living through an unusual moment in which the question of "what is permanent" is being asked in new places. AI systems are trained on what we have done and told: "This is what you are like." Personalized recommendation engines build a 常 of us every day. Neuroscience is asking whether there is a stable substrate beneath the changing contents of awareness. Even capital markets increasingly price in "permanent" changes (climate, demographics, AI capabilities) that may not be permanent at all. In all these places, the Buddhist 常法 analysis is freshly relevant: what kind of "permanent" are you claiming, on what basis, and what are you doing with the claim? The classical tradition has spent centuries refining exactly this question.
常见误读与澄清
Let me close by clearing up the most common confusions this word generates, including some that have made their way into contemporary Buddhist writing.
Misreading 1: 常法 means "eternal soul" or "permanent essence"
When readers first meet 常法 in the *Mahāparinirvāṇa Sūtra*'s sense, they often read it as a plain "eternal soul" claim — and then assume Buddhism is secretly a religion with a permanent self after all. This is half right and half wrong. The half-right part: yes, the *Mahāparinirvāṇa Sūtra* affirms that there is something unconditioned and not subject to arising-and-ceasing, and it calls this 常. The half-wrong part: this 常 is explicitly distinguished from the ordinary self, ordinary permanence, ordinary substance. The text says it is 无为 (unconditioned), 无生 (unarisen), 无灭 (unceasing), 非三世 (not in past/present/future), 不为阴界入所摄 (not contained in the five aggregates, eighteen senses, twelve sense-bases). So it is not the kind of "permanent thing" you could point to in space. The 常 of the *Mahāparinirvāṇa Sūtra* is more like the constancy of a principle than the persistence of an object. If you flatten it into "eternal soul," you have imported exactly the kind of 常 that Nāgārjuna dismantles.
Misreading 2: 常法 means "impermanence teaching"
Some readers, having heard so much about impermanence (无常) in Buddhism, assume that 常法 must be a minor term that just means "the opposite of impermanence, which Buddhism rejects." This is the Face 2 reading, taken as the whole story. It misses that the *Mahāparinirvāṇa Sūtra* uses 常法 to mean "true permanence" — the 常 of 常乐我净 — and treats it as the deeper teaching, not the lesser one. The two are not contradictory: ordinary conditioned phenomena are impermanent (无常), and the unconditioned is permanent (常). Both are affirmed. The error comes when readers think "permanence" must be the wrong view and "impermanence" must be the right view. Both are partial views; the full teaching involves both.
Misreading 3: Nāgārjuna and the *Mahāparinirvāṇa Sūtra* contradict each other
Some readers, having read the *Madhyamaka* dismantling of 常法 and the *Mahāparinirvāṇa Sūtra* affirmation of 常法, conclude that the Buddhist tradition is split and one side must be right. The classical Chinese Buddhist commentarial tradition does not see it this way. The two texts are usually read as operating at different levels and addressing different opponents. The *Madhyamaka* targets the abstract metaphysical claim of "real permanent dharma" (实有的常法) and shows that dependent origination leaves no room for it. The *Mahāparinirvāṇa Sūtra* targets the practical worry of devotees that nirvāṇa is annihilation, and shows that the unconditioned is not nothing. Both can be true at once: there is no *fixed-nature permanent dharma* (no 常法 in Face 2 and Face 4's sense), and there is an *unconditioned that does not arise and pass* (常法 in Face 3's sense). Different texts, different jobs, no contradiction at the level the texts are trying to make. (Whether this resolves the philosophical tension at a deeper level is a serious question, but it is not a contradiction in the sense of "one text says X and the other says not-X.")
Misreading 4: 常法 is the same as the 常 in 平常 ("ordinary")
In modern Chinese, 常法 sometimes sounds like a literary way of saying "the usual way" or "ordinary things." This colloquial sense can creep into Buddhist reading, and you can end up with a translation like "the ordinary dharma" or "the normal practice." This is a confusion with the Face 1 sense — the "fixed track" sense — applied too loosely. Face 1 is a specific literary-narrative term referring to the Buddha's birth convention. It is not a general term for everyday life.
Misreading 5: 常法 as a fixed-nature claim about yourself is a Buddhist teaching
In some contemporary mindfulness and Buddhist-adjacent writing, you hear claims like "your true nature is peace" or "your Buddha-nature is unchanging," stated as if they were uncontroversial Buddhist doctrines. These claims are Face 3's 常 expressed in a casual register. The classical *Mahāparinivāṇa* texts would not object — they make similar claims. But the *Madhyamaka* would object to the way such claims are often deployed: as fixed-nature statements about a "real you" that can be pointed to, located, identified with, used as a metaphysical foundation. This is Face 2's 常 dressed up as Face 3's wisdom. The classical move would be: yes, there is a 常 that is your deepest nature — but it is precisely the kind of 常 that cannot be made into a fixed-nature claim about yourself. The moment you say "I am fundamentally peaceful" as a metaphysical assertion, you have left Face 3 and re-entered Face 2.
Misreading 6: 常法 is what AI is "really" doing
Some contemporary writers, struck by how AI systems infer fixed patterns from observed behavior, have compared AI's "user model" to Buddhist 常法. This comparison is suggestive but not exact. AI user models are explicitly built from observed data and are updated as new data arrives — they are working hypotheses, not metaphysical essences. The classical Buddhist worry about 常法 is about the move from observed pattern to fixed-nature claim — a move the meditators in the *Dīrghāgama* made, and that contemporary humans make constantly. AI does not yet make this move on its own (though its users often do, by treating its recommendations as definitive). So the comparison is useful as a mirror for our own 常-making habit, not as a confirmation that AI has achieved 常法.
The word 常法, then, is a small word with a long shadow. Three texts, three faces, one problem: how to speak truthfully about what lasts. The *Dīrghāgama* warns that "things last forever" is often a wrong view. The *Mahāparinirvāṇa Sūtra* affirms that "something truly lasts" — the unconditioned, the witness, the depth. Nāgārjuna shows that even the assertion of "something truly lasts" can become a conceptual trap if you reify it. The practice is not to choose between these — it is to learn to hold all three at once without collapsing into any of them. That holding is itself a kind of 常: the constancy of a mind that can see permanence claims of all kinds without grasping at any of them as final.