Alright, today let's take this seemingly simple yet genuinely tricky term—異性 (anya-svabhāva, "different nature")—and break it down piece by piece.
What This Concept Is Saying
"異性," literally, means "a different nature." In Buddhist treatises, it is not an independent entity but a word used to describe a *relationship*—it refers to the fact that, relative to a given 法 (dharma, "thing/phenomenon"), another dharma's essence is "distinct" from it. This sense of "being distinct" constitutes one of the basic frameworks through which we perceive the world: this is right, that is wrong; this is good, that is evil; this is you, that is me.
It sounds straightforward, doesn't it? Yet it is precisely this most obvious "difference" that Nāgārjuna (龍樹菩薩) dissects most sharply in the *Middle Treatise* (《中論》). His logic runs:
1. Difference requires a counterpart: The claim "different" must be grounded in the existence of at least two dharmas. When we say "apple" is different from "orange," the premise is that both "apple" and "orange" genuinely exist. 2. Without self-nature, there is no mark of difference: But if "apple" and "orange" themselves are each brought together by causes and conditions (因緣, hetu-pratyaya), arising and perishing in every instant, with no fixed, unchanging "self" (自性, svabhāva)—then how could the "difference" between them be independent and substantially real? If no fixed, unchanging "apple-nature" can be found in the apple itself, from what could an "orange-nature" that is "different from apple" be established? 3. Conclusion: Therefore, whether "sameness" (一, ekatva) or "difference" (異), at the level of ultimate truth (勝義諦, paramārtha-satya) both are "unobtainable" (不可得, anupalabdha)—they are merely conceptual tools that our mind-consciousness (心識, citta) sets up in the relative world, for the convenience of communication and cognition. They are not the final reality (實相, tathatā).
Thus, the concept of 異性, in classical treatises, is not something you go out and "find"; it is a pattern of thought you are meant to "see through." It points to a deeply entrenched assumption in our cognition—that there are real boundaries between things—and seeks to dismantle that assumption.
A Walkthrough in Daily Life
Let's walk through the most ordinary scenarios of a day, and you'll find this concept everywhere.
Scenario One: "Me" and "Him" on the Commuting Subway
During rush hour, you're packed into the subway. The person in front of you has legs crossed, earbuds in, and is playing a short video on speaker at full volume. A thought immediately arises in your mind: "This person has no manners."
Here, "I" am a subject, and "this person" is an object. A strong sense of 異性 arises between me (the civil, quiet one) and him (the uncivil, noisy one). This 異性 makes you feel the two of you are fundamentally different kinds of people.
Mapping to the classical definition: How is this 異性 established? It depends on the substantial reality of both "me" (a quiet commuter) and "him" (a speaker-phone video watcher) as two dharmas. You take "me" to have the self-nature (自性) of "civility," and "him" to have the self-nature of "rudeness"—the two utterly distinct.
Walkthrough: Look closely. Does "he" really possess an eternal, unchanging self-nature of "rudeness"? Perhaps something urgent came up at home and he's frantically trying to reach family, forgetting his earbuds. And what about your "civility" self-nature? Yesterday, when you were exhausted after work, didn't you also collapse into your seat with your phone blaring? When the causes and conditions for "his" behavior (an emergency, anxiety) are absent, does the "rude him" still exist? When the causes and conditions for your "civility" (ample energy) are absent, does the "civil me" still exist?
Pointing out the misreading: Many people interpret the "difference" here as "I should be more tolerant of others." That's all well and good, but it's not what Buddhism means. Buddhism means that the very boundary-feeling that generates "I am different from him" is itself constructed. It feels very real, and it generates aversion; but beneath it, there are only dharmas in constant flux. What you dislike is the dharma "the speaker-phone sound," not a fixed "person." When you mistake the dharma (the sound) for a person (a substantially real "him"), this 異性 becomes fuel for hatred. When you see the momentary arising-and-perishing of dharmas, the wall of that 異性 begins to loosen.
Scenario Two: "Useful" vs. "Useless" Information While Scrolling
You're lying on the couch scrolling through short videos. The algorithm serves you a cooking video; you find it "useful" and think you'd like to learn it. Next comes a video of cats fighting; you find it "useless" and swipe past in a second.
Mapping to the classical definition: Your mind-consciousness swiftly renders a verdict of 異性 between "useful" and "useless." You take the cooking video to have the self-nature of "usefulness," and the cat video to have the self-nature of "uselessness."
Walkthrough: Where is that "usefulness" self-nature? If tonight you're in a terrible mood, you won't even want to look at the cooking video. And if the cat video makes you laugh, easing your anxiety, hasn't it become "useful"? You see—"useful" and "useless" are not inherent "differences" in the things themselves; they depend on your state of mind (causes and conditions). When you go along with the algorithm, you are constantly reinforcing these 異性 judgments of "this is good," "that is bad," all the while forgetting that at bottom they are just flows of data.
Pointing out the misreading: This is not a call to "stop making choices." You need to choose what to watch; that's a function of living. The question is whether you are being held hostage by these 異性 judgments. When you see a "useless" video, anxiety arises—"I'm wasting time." When you see a "useful" video, greed (貪心, rāga) arises—"I need to save this." Both emotions are built on your clinging (執著, abhiniveśa) to the substantial reality of 異性. Practice doesn't turn you into a stagnant pool that can no longer tell good from bad; it lets you tell good from bad while knowing inwardly that this "good/bad" is relative, conditioned, and empty of self-nature. That way, you are neither bound by the "good" nor wounded by the "bad."
Scenario Three: "Us" and "Them" in an Intimate Relationship
You're arguing with your partner. You say: "We're just incompatible in personality." In that sentence, you are treating the 異性 between you and your partner as a real, unbridgeable fact. You think to yourself: "I like quiet; he likes excitement. We are fundamentally different."
Mapping to the classical definition: You define "liking quiet" as the self-nature of "me," and "liking excitement" as the self-nature of "him," and you take these two self-natures to be absolutely mutually exclusive "differences."
Walkthrough: Ten years ago, you liked quiet. What about now? Surely there are times you want excitement too. Is the "me who likes quiet" a permanent, unchanging entity? The fact that he wants excitement today—is that because it's his nature, or because he achieved something at work and wants to celebrate? If he fails tomorrow and wants only to be alone, where does the "him who likes excitement" go?
Pointing out the misreading: This is where people most often go wrong, reading 異性 as "personality differences that need to be accommodated." That's not wrong, but the depth of Buddhism lies here: "personality difference" itself is just a label attached to flowing thoughts and emotions. You cling to a "self that likes quiet," so when your partner is noisy, you feel that "self" is threatened, and suffering arises. The suffering doesn't come from your partner's noise (that is a dharma); it comes from your clinging to the boundary of the "self who likes quiet" (the clinging to 異性). When you release that clinging and allow the concept of "me" to also shift with causes and conditions, your partner's noise is no longer an attack—it's just a sound.
Why Contemporary People Need It
Contemporary life is an era shattered into fragments by "difference."
1. Against algorithmic polarization: To capture your attention, algorithms work hard to intensify your 異性 cognition. They feed you what you like to see, making you feel "those who agree with me are wise; those who differ from me are foolish" (與我同者智，與我異者愚). Your first reaction to a different viewpoint is "how can they be so stupid," not "what causes and conditions put them there." The clinging to the substantial reality of 異性 is the psychological root of online hostility and social fragmentation. Understanding that "異性 is without self-nature" doesn't mean abandoning your position; it means that, on top of your position, you no longer generate that "those not of my kind must have alien hearts" (非我族類，其心必異) hostility. You can see the other person's viewpoint as a convergence of causes and conditions (their background, education, experience) rather than a substantially real "enemy." 2. Relieving identity anxiety: We desperately label ourselves—"I'm an I-person" (introvert), "I'm a programmer," "I'm middle class"—all in order to establish the 異性 between "me" and "others." But this 異性 is fragile. The moment you meet someone more introverted than you, your "I-person" label is threatened, and anxiety arises. Understanding that "異性 is without self-nature" means seeing that all labels are temporary, relative, and selfless. You can use those labels as tools of communication, but you needn't treat them as the foundation that proves "I exist." The anxiety of identity stems from trying, in a selfless world, to grab hold of a substantially real "me" to distinguish from "not-me." 3. Freedom from comparison: Much of modern suffering comes from comparison. A colleague gets promoted, a friend gets rich—that sense of "he is stronger than me," the 異性, cuts like a knife. The essence of this comparison is the conviction that "his success" and "my failure" are two substantially real, mutually independent, even opposing self-natures. But from the Buddhist perspective, your dharmas and his dharmas are both flowing within causes and conditions. His promotion is conditions; your low point is also conditions. These conditions are neither fixed nor independent. When you see this, you stop treating "his favorable conditions" as the opposite of "your unfavorable conditions," and you gain a breath of cool relief from that cruel 異性 comparison.
Common Misreadings and Clarifications
1. Misreading One: Equating 異性 with "repulsion" or "contradiction" - Clarification: 異性 is only a neutral description, meaning "essences are distinct." A table and a cup are different, but not hostile. What Nāgārjuna refutes is not the phenomenon of "difference" itself, but the clinging to a substantially real self-nature behind "difference." You can say "this plan differs from that plan"—that is worldly wisdom. But if you think "this plan has an absolutely superior self-nature, and that plan has an absolutely inferior self-nature," that is the 異性-clinging that needs to be refuted.
2. Misreading Two: Taking "difference is unobtainable" to mean "difference is eliminated" or "everything is the same" - Clarification: This is the most dangerous misunderstanding. Saying "異性 is without self-nature" does not mean that "sameness" is the truth. Refuting "difference" is simultaneously refuting "sameness" (because "sameness" is established relative to "difference"). If "difference" is not substantially real, then the "sameness" opposed to it is also not substantially real. The conclusion is "both sameness and difference are unobtainable" (一異俱不可得)—not "there is only sameness, no difference." So a practitioner does not become a muddle-headed fool who can't tell blue from green or right from wrong. He still knows the difference between an apple and an orange; but he knows this difference is not substantial, not fixed, and not representative of final truth. He lives in the world, yet is not bound by the marks of "difference" in the world.
3. Misreading Three: Thinking 異性 is some concrete thing, like a "point of difference" - Clarification: 異性 is not a "point" that can be pointed to. It describes a relationship. Like "left and right": you can't point at one thing and say "this is left." Left is established relative to right. Likewise, 異性 is established relative to sameness (同一性). It is a conceptual structure, not an entity. What we need to see through is precisely the illusory nature of this structure itself.
In sum, the concept of 異性 is an extremely sharp scalpel in the Dharma. It doesn't hand you an answer; it cuts open your "taken-for-granted" cognition, letting you see that behind those solid "differences" there are actually dharmas that are flowing, interdependent, and without self-nature. What it ultimately points to is not "we are the same," nor "we are different," but a transcendence of the binary opposition between "same" and "different"—seeing the more fundamental, non-contentious reality (無諍, araṇā). In that reality, there is no "me" to defend and no "him" to reject—only the endless, instant-by-instant arising of dependent origination (緣起, pratītyasamutpāda).