What this concept is really saying
In classical Buddhist logic (因明, *hetuvidyā*), every syllogism has three limbs: the proposition (宗, *pratijñā*), the reason (因, *hetu*), and the example (喻, *dṛṣṭānta*). The *reason* is the load-bearing step. A well-formed reason carries the proposition to its conclusion; a malformed one breaks the inference down. The Indian tradition's diagnostic for argument failure is unusually precise — it separates broken reasons into three structural kinds, each with its own signature.
相違因 ("opposing reason," Skt. *viruddha-hetu*) is the second of those three. Its specific failure is not vagueness, not missing evidence, not loose relevance — but active inversion. When you follow a 相違因 honestly to where it points, the conclusion you land on is the negation of the proposition (dharma, 所立法) you set out to prove. The reason doesn't fail to support the thesis; it supports the *anti-thesis*. That is the precise fingerprint the tradition is tracking.
Two classical paths arrive at the same diagnosis, and reading them together is what makes the concept sharp. The Tibetan-commentary lineage (in *Nyāyapraveśa* / 《正理滴論》) defines it in terms of *inverted logic*. The Yogācāra lineage (in 《瑜伽師地論》 and 《顯揚聖教論》) defines it in terms of *causal obstruction*. They are not two different ideas; they are two ways of describing the same structural wound.
The Nyāya-influenced definition: two aspects inverted
To understand the 《正理滴論》's definition, you need its parent concept first: a valid reason has to satisfy *two aspects* (二相, *dvi-rūpa*).
- 同品定有 — the reason must definitely be present in cases *similar to* the proposition (the "homologous instances"). - 異品遍無 — the reason must definitely be *absent* from cases *dissimilar to* the proposition (the "heterologous instances").
If those two aspects are present in normal orientation, the reason carries the argument. If they are *inverted* — present where they should be absent, absent where they should be present — you have a 相違因. The text puts it precisely: *"二相颠倒成立，亦是相违"* — when the two aspects are established in inverted form, this is also a contrary reason.
The classical illustration is sharp. Suppose someone tries to prove that sound is *permanent* (常住). They offer two possible reasons: "because it is produced" (所作性), or "because it issues continuously from effort" (勤勇無間所發性). On the surface these look like real properties of sound. But follow the reason to where it points: produced things are impermanent; what issues from effort is impermanent. So the very property that was offered as evidence for permanence is, when honestly traced, evidence for *impermanence*. The relationship between reason and proposition is structurally reversed — exactly the failure pattern of 相違因.
Notice what this is not. It is not the failure of having no reason (that's 不成因, *asiddha-hetu* — "unestablished reason," where the reason's own existence in the subject is in question). It is not the failure of being unable to tell which way the reason points (that's 不定因, *anaikāntika-hetu* — "indeterminate reason," where the reason's relationship to both 同品 and 異品 is too ambiguous to bear weight). It is the failure of pointing in the wrong direction with conviction.
《正理滴論》 also addresses a subtler worry. When someone argues "the senses are necessarily for the use of another, because they are aggregated" (眼等必為他用, 以積聚性故), the opponent may object that the *intended meaning* (意許) of the proponent is contradicted by the reason itself, since aggregated things include couches and bedding — things used by the person themselves, not "another." Does this create a *third* kind of contradiction (第三相違)? The text's resolution is elegant: the reason only belongs to those two aspects; if you treat both the *intended meaning* (意許) and the *literal expression* (言詮) as the proposition being proved, then the inversion of the established proposition is just the same as the inversion of the two aspects. There is no third kind of contrary reason lurking here — only the standard failure that the same diagnosis already covers.
The Yogācāra definition: an obstructing cause
The 《瑜伽師地論》 and 《顯揚聖教論》 reach the same diagnosis via a different vocabulary. For them, 相違因 is established on the basis of an *obstructing-cause support* (障礙因依處). The text states the principle cleanly: *"於所生法能障碍因，名相违因。此障碍因若阙、若离，名不相违因"* — a cause capable of obstructing the arising of the thing to be produced is called a contrary reason; if this obstruction is absent or removed, it is called a non-contrary reason.
The logic is causal rather than syllogistic. When a thing that should arise is obstructed by a present cause, it does not arise. The obstructing cause is a 相違因 with respect to that phenomenon.
The text draws out the implications carefully:
- It applies across the four "bindings" — *desire-bound* (欲繫), *form-bound* (色繫), *formless-bound* (無色繫), and *unbound* (不繫) — meaning the diagnostic isn't limited to one realm of experience. - It applies not just to *arising* (生) but also to *obtaining* (得), *establishing* (成), *accomplishing* (辦), and *functioning* (用). Obstruction as a category reaches across the entire span of the productive world. - The examples are vivid and instructive. A touch (觸) that *agrees with pleasant feeling* (隨順樂受) — when pleasant feeling is experienced, the minds corresponding to painful or neutral feeling cannot arise, "by virtue of being opposed" (以相違故). The pleasant-feeling occasion is itself an obstructing cause for the parallel states that don't match it. Even more pointedly: when a mind is bound up in *greed* (貪纏所纏), the greed-corresponding mind is present, and the *anger*-corresponding mind cannot arise; when the situation reverses, anger-obstruction prevents greed. Two mental states, occupying the same locus (同處), cannot both get actualized — and the active one is functioning as a contrary reason against the inactive one.
Six kinds of "contrariness," and why only one is in view
The 《瑜伽師地論》 also lists six kinds of *contrariness* (六種相違) in the broader sense — places where things can be "against" each other:
1. 語言相違 — verbal contradiction (where śramaṇas' and brāhmaṇas' treatises contradict each other internally). 2. 道理相違 — rational/probative contradiction (where one's inference doesn't accord with probative standards, 證成道理). 3. 生起相違 — arising-contradiction (productive cause is lacking or obstructive cause is present). 4. 同處相違 — same-locus contradiction (light and dark; pleasure and pain; greed and hatred — these cannot share a single place). 5. 怨敵相違 — enemy contradiction (snakes and mongooses, weasels and cats — natural adversaries whose presence is hostile to the other's presence). 6. 障治相違 — counteractive contradiction (the meditation on impurity counteracts greed, the cultivation of loving-kindness counteracts anger, the seven factors of enlightenment counter the afflictions — each remedy is "against" the disorder it cures).
Then comes the crucial disclaimer, and we should not skip it: *"於此義中，正意唯取生起相違"* — within the proper meaning of a contrary reason (as a *term of art* for the 因-system), only the third — *arising*-contradiction — is in view. The other five kinds of contrariness are real phenomena, and the Yogācāra tradition wants you to know they exist; but when the discourse is about formal inference and the diagnosis of broken reasons, the technical sense of 相違因 narrows itself to the obstruction-of-arising type. So when you hear someone say "this is a 相違因 in 因明" in the classical registers, they are almost always pointing at the productive/obstructive sense, and *that* is the sense we'll walk through below.
Where 相違因 sits in the wider causal architecture
A few location-markers, since you should know where this idea lives:
- 相違因 is one of three broken reasons (似因, *ābhāsa-hetu*) — alongside 不成因 (unestablished) and 不定因 (indeterminate). The triad is stated canonically: *"三相中每一相各有二过，即不成或犹豫；三种似因过者即不成、相违、不定"* — within the three aspects, each has two faults (unestablished or hesitant); and the three kinds of fallacious reasons are unestablished, contrary, indeterminate. - 相違因 belongs to *facilitating causes* (方便因), not to *productive causes* (能生因). That is, its causal role is to enable or disable, not to generate. - Within the *four conditions* (四緣) framework, it is folded under the *dominant condition* (增上緣): *"若方便因，是增上缘."* - It is paired with its opposite, *non-contrary reason* (不相違因), and the distinction between them is exactly whether obstruction is present or absent.
One more technical neighbor worth knowing: 相違決定 (determinate contradiction) — a stronger cousin of 相違因 where the contradiction becomes so decisive that the proposition itself becomes unable to be the object of inference. The 《正理滴論》 notes this is technically not a fault of the *reason* but a fault of the *thesis* (宗過), and so is set aside in the discussion of broken reasons.
Walking it through in modern life
The technical machinery above is exact, but the reason it stays alive across centuries is that the pattern shows up wherever humans construct reasons. Let's walk through several contemporary scenes and map each one carefully to the classical structure — flagging, where it matters, where the mapping is exact and where it's evocative rather than identical.
Scene 1: The pitch deck that argues against itself
A startup founder presents to investors. The slide says: *"We have a humane workplace."* The supporting bullet: *"Our retention rate is industry-leading."* On the surface this seems like it should fit. But follow the reason. Industry-leading retention is generated primarily when compensation and working conditions beat competitors — that is, by outperforming on the very metrics of monetary and structural pressure. A truly *humane* workplace (meaning one organized around human flourishing rather than the rule of metrics) wouldn't need to compete on retention; it might retain differently or release staff generously. The "retention rate" reason, followed honestly, points not at humaneness but at *competitive optimization*. The given reason testifies against the proposition. This is a 相違因 in the Nyāyapraveśa sense: the two aspects are inverted — what was meant to support humaneness actually has its natural home among different propositions (high performance, market discipline).
This is not just "bad rhetoric." The structure of the argument is the structure of *inverted support*. A different (non-broken) reason for the same proposition would sound like: "People who leave us describe the experience in their own words, and those descriptions are thick with growth, rest, and dignity." That reason, traced, points *toward* the proposition. Different reason, different structural outcome.
Scene 2: The self-justifying journal entry
Late evening. You write in a journal: *"I'm a thoughtful person, because I always know what I think."* The 因 ("always knows what I think") is offered as evidence of thoughtfulness. But follow it. *Always* knowing what one thinks is more naturally a property of *unreflective certainty* — people who don't notice their own ambivalence, who suppress emerging doubts quickly, who don't experience the slow churn of not-yet-knowing that thoughtful minds move through. The structural pattern of the 因 is more characteristic of its absence than its presence. Following the reason honestly, you land near: "I am settled and untroubled by inner movement," which is almost the opposite of "thoughtful." This is the Nyāya-style 相違因: same-person same-target-case, but the property being claimed is the natural evidence of a different conclusion.
Scene 3: The Yogācāra version — self-sabotage at the desk
Now we shift registers. The Yogācāra sense is about *causal obstruction*, not about two-aspect inversion in argument.
You sit down to write. The thing to be produced is the writing (所生法). What is present? Email open. Slack open. A phone in arm's reach. Each of these is a *cause capable of obstructing* the production. With these present, the writing does not arise. Each email-checking action is functioning as a 相違因 in the obstruction sense — the same term, applied to the same kind of failure (the action is the structural opposite of the goal), now in the causal register rather than the syllogistic one.
Map this carefully: in this reading, the "thesis" (what should arise) is the writing. The "reason" within the obstruction-pattern is whatever operates as its disabling condition. In Yogācāra framing, the diagnosis is *which obstruction is present?* The remedy is *which obstruction has to leave?* — and that mirrors its companion term, 不相違因, the unmarked facilitating cause that prevails when the obstruction is absent or removed.
Scene 4: The couple in conflict — the 同處相違 operating causally
A couple in escalating argument. She says, *"I'm calm, I just want to discuss this rationally."* But she is breathing quickly; her jaw is set; her shoulders are raised. The bodily profile is a near-textbook case of physiological arousal. In the Yogācāra taxonomy, *calm* and *fight-or-flight arousal* are 同處相違 — they cannot occupy the same place. The body is exhibiting active obstruction of the very calm that is being claimed. The arousal (which is *present*) functions as a contrary reason against the calm (which is the stated goal). Note the diagnosis: this isn't primarily about dishonesty or performance — it's about *which antecedent condition is in fact operative*. The remedy for arousal-as-contradictory-reason is the same as in the 因明 texts: remove the obstruction (slow breath, drop the shoulders, defer the discussion) so the calm can arise.
The Yogācāra tradition would resist reading this as "she's lying to herself" — it would read it as *which condition has the field*. Identifying the active obstruction is what makes the change available.
Scene 5: Parental anxiety producing the very thing it fears
A parent watches a child learn to ride a bike. They want the child to ride with confidence. They say, repeatedly: *"Be careful!"* in a tone that conveys worry. The 因 being offered to the child (the parental instruction-as-condition) is, in the Yogācāra frame, an *obstructing cause* against the rising of confidence-in-riding. With those antecedents operating, the very capacity the parent wants is impaired. The 因 operates as 相違因 — the parental reason, taken into account causally, prevents the production of the stated thing. The remedy is not "don't be careful" but "swap which antecedent condition has the field."
This is one of the most useful contemporary applications of 相違因: most of what we call "anxiety-producing parenting," "anxiety-producing management," "anxiety-producing friendship," follows this exact structure. The reason's surface content often has nothing to do with the failure; it's the *operative power* of the reason in the situation that inverts the outcome.
Scene 6: The political speech where the *stated* argument proves the *implied* one
A political figure says: *"We must restore order, because the streets are full of peaceful protesters."* Follow the reason. "The streets are full of peaceful protesters" — a property of the present situation — is being offered as cause for restoring order against peaceful protesters. The phrase, taken at face value, is a property *of the protesters' claim to be peaceful* rather than of disorder. So the 因 actually constitutes evidence not for "restore order" but for "the protesters have made their case non-violently," which is one of the things order is supposed to protect. The structural support points in the opposite direction from the conclusion being drawn. This is classical 相違因 in the inverted-aspects sense, and recognizing it is one of the central skills that classical 因明 training was designed to cultivate.
The mapping-error to flag right now
A note on where modern readers most often go wrong in mapping this concept onto life:
- "相違因 means 'my reasoning was wrong.'" No — wrong reasoning has *three* structural kinds, and 相違因 is only one of them. Sometimes the problem is that the reason doesn't apply (不成). Sometimes the problem is that the reason is too vague to support anything specific (不定). 相違因 is specifically the *active-inversion* pattern. Treating all three as the same flattens a distinction that the tradition went to great length to preserve. - "相違因 means 'I'm being inconsistent.'" Not quite. A self-contradictory sentence ("I am lying right now") is a different logical problem. 相違因 is about a *reason's* orientation, not about a *proposition's* self-contradiction. - "相違因 = 'lying' or 'bad faith.'" No. The opposite-aiming reason can be entirely in good faith. The reason itself, as a reason, simply points the wrong way. The 相違因 diagnosis is structural, not moral. - "相違因 only shows up in formal arguments." The Yogācāra reading shows clearly that it shows up anywhere there is causation. Self-sabotage is a 相違因 scenario; physiological arousal contradicting calm is a 相違因 scenario. It is not reserved for syllogisms.
Why contemporary people need it
Three reasons stand out, and none of them are about becoming an ancient logician.
1. We swim in reasons that point the wrong way. Contemporary discourse — political, marketing, self-help, even therapy-speak — is saturated with *defensible-sounding reasons* that on inspection are evidence for the opposite of what they're offered for. The classical tradition's diagnostic is unusually crisp: if you can recognize a 相違因 on sight, you can filter a lot of low-quality persuasion. Not by being cynical — by being precise. The tradition is not anti-reason; it is in service of better reason.
2. Self-sabotage is recognizable as a structure. Most contemporary talk about self-sabotage stays in the register of "I keep getting in my own way" — a description, not a diagnostic. The 相違因 framework gives you the diagnostic: *what is the operative antecedent condition, and what is it obstructing?* Once you can name the obstructing cause as such, the remedy path becomes obvious — not because you have improved willpower, but because you have correctly identified the active counter-cause. That's the heart of the Yogācāra move. Notice the parallels to contemporary psychological work on *motivational interviewing*, *Internal Family Systems*, and *Acceptance and Commitment Therapy*, all of which are essentially practices for identifying and rearranging operative antecedents. They're working in similar territory. The correspondences are striking; they are not equivalences. The Buddhist tradition is doing causal analysis for the purpose of liberation; the therapeutic traditions are doing causal analysis for the purpose of suffering reduction. The frameworks rhyme. They do not prove each other. And both have plenty of open questions about how the inner causal map actually behaves in detail.
3. Mindfulness of reasoning is a survival skill for an attention economy. Contemporary information systems are largely engineered around the principle of *strong-affect capture*, which has its own structural relationship to the 相違因 pattern: signals offered as support for "this content is good for you" are often, on inspection, evidence for "this content keeps you engaged." Engagement is not the same as goodness for you; it is more naturally a property of a different proposition. Algorithms, in this sense, tend to operate as friendly cousins of 相違因 — not formally identical (they aren't running Nyāya syllogisms), but functionally resonant. Recognizing the inversion pattern in the small can inoculate you against missing it in the large.
Common misreadings and clarifications
A few error patterns come up again and again. Naming them precisely is the most useful thing I can do here.
Misreading 1: "A contradictory reason means my argument has the conclusion backward." Partially right, partially off. The Nyāya-style formulation is that the *reason itself*, traced honestly, supports the negation of the proposition. That's the strict form. But the Yogācāra formulation is broader: it's any *cause capable of obstructing* the production of what one is trying to establish. Both are called 相違因. So when you map the term onto lived situations, you have two registers available — argument-inversion and causation-obstruction — and the term legitimately applies in both. They are not two separate concepts; they are the same diagnostic applied to two substrates (argument and causation).
Misreading 2: "If my reason proves the opposite, I should abandon my position." Not quite. The diagnosis tells you only that *this reason* points the other way. It doesn't tell you that the *position* is wrong. Often a 相違因 is one of the most useful things that can happen to a position: it shows you that the framing you offered for your position is the wrong framing. The position may still be true; it just needs a different reason. (And sometimes — this is the part that matters — the 相違因 is what reveals that the position was being held for reasons that, examined honestly, are not reasons for it at all. The classical diagnostic doesn't resolve that for you; it just hands you the structural feature.)
Misreading 3: "相違因 = formal contradiction." No. Formal contradiction is when the proposition itself entails its own negation. 相違因 is when the *reason* bears on the negation of the proposition. These are different. A claim can be logically consistent and still have a 相違因 supplied for it; a claim can be formally contradictory on its own without any 相違因 needing to be involved.
Misreading 4: "Any negative or challenging reason is a 相違因." No. A negative reason is not by itself an inverted reason. A reason counts as inverted only when, *followed honestly*, it testifies against the proposition. Lots of reasons are genuinely challenging and remain on the same side as the thesis (they just don't fit, or they weaken, or they need refinement). The inversion pattern is specific.
Misreading 5: "The 六種相違 are six meanings of 相違因." Almost the opposite. The Yogācāra tradition lists six kinds of contrariness in the broad sense, *then* cautions that for the specific 因-system meaning, only *one* (生起相違, obstruction-of-arising) is in view. The other five are real phenomena — same-locus contradictions, enemy contradictions, counteractive remedies — but they are not the technical meaning of 相違因. Conflating them is one of the most common interpretive errors in reading the Yogācāra material.
Misreading 6: "相違因 = bad faith." Already touched above, but worth restating: the diagnostic is structural. People can offer contradictory reasons sincerely, in good faith, and without any intent to deceive. The diagnosis addresses the relationship between reason and proposition, not the moral character of the speaker. Good faith + contradictory reason is a fully coherent — and very common — configuration. Recognizing it as structural, not as dishonesty, is part of what makes the diagnostic compassionate rather than accusatory.
Misreading 7: "Identifying a 相違因 is enough." Often it's the beginning. The next move depends on which register you're in. In the Nyāya register, the move is to find the *correct* reason — one whose two aspects are properly oriented. In the Yogācāra register, the move is to find and *remove* the obstructing cause so the non-contrary conditions can prevail. In neither case does the diagnosis itself do the work; it just makes the work possible.
If you take one thing with you from this: a 相違因 is a reason which, taken seriously, ends up arguing against what it was meant to argue for — and in the Yogācāra extension, a cause which, taken seriously, *operates against* what it was supposed to produce. The diagnostic works the same way in arguments, in habits, in families, and in the small collisions of an ordinary day. Its deepest service is not catching other people's mistakes. It is catching, gently and with some structural precision, the moments when your own stated reasons and your own operative conditions are working at cross-purposes. That recognition, more than any fine wording about it, is what the tradition is for.