I. What This Concept Is About
"同中有異" (tong zhong you yi — "within sameness, there is difference") is a contemplative formula from the mature Chan tradition. It says: when two things, moments, or persons belong together in some deeper identity, that belonging does not erase their individual texture, function, or work. They remain the same *and* remain different. The formula is always spoken together with its mirror: 異中有同 (yi zhong you tong — "within difference, there is sameness"), so that the two together form a single bidirectional lens. Read alone, either half collapses into a half-truth. Read together, they hold open a fluid, non-collapsing perception.
The richest articulation we have comes from Hongzhi Zhengjue (宏智禪師, 1091–1157), one of the great masters of the Caodong (曹洞) school. In three different dharma talks in his Extensive Record (《宏智禪師廣錄》), he never uses the phrase alone. He always says something like: "In what is clearly awake — within sameness, there is difference. In what is purely still — within difference, there is sameness." Or, more compressed: *"同中有異異中同，徹底渾淪無縫罅"* — "Sameness-within-difference, difference-within-sameness, all the way through, without a crack."
That last line is the key. Hongzhi's claim is not balanced or moderate. It is uncompromising: at the deepest level, sameness and difference interpenetrate so completely that there is no seam between them. They look like opposites only at the level of refining practice (修行觀照之微細處). Below that, they are one movement.
The Four Layers Hongzhi Uses to Open It Up
1. Bidirectional pairing. "同中有異" is always paired with "異中有同." If you only hold "同中有異," you risk reading reality as a kind of underlying unity that secretly contains messy particularities — but the particularities get no home. If you only hold "異中有同," you risk reading reality as an arena of differences that secretly cohere — but the coherence feels cosmetic. Together they are a single contemplative gesture: *the same ground precisely because it does not flatten the differences; the differences precisely because they don't break the ground.*
2. The 功位 (gōng/wèi) frame. This is the most distinctive layer, and it is what makes the concept distinctly Caodong. 功 (gōng) is *active functioning, work, the exertion of efforted practice* — the moment of engagement with phenomena, the skillful activity of wisdom. 位 (wèi) is *the underlying position, the unchanging ground* — what one is when all efforting drops, the self-existing nature. Hongzhi maps them:
- *同中有異* ⟷ 功亡就位 (gōng wáng jiù wèi) — "when active functioning exhausts itself, one settles into the position." The ground is reached not by adding anything but by letting go of willful activity. And yet — and this is the punchline — even in that rest-as-ground, the differentiated *機用* (jī yòng: functional responsiveness, the ability to act appropriately in situations) is not lost. The same ground is operative difference.
- *異中有同* ⟷ 在位借功 (zài wèi jiè gōng) — "remaining in the position, one borrows functioning." When wisdom settles into the ground, it does not stay inert. It acts — but acts *from* the position, not from self-will. The differentiated activity is one with the ground.
He restates this in another talk as: *"功中退步就位，位裏移身借功"* — "Within function, step back into the position; within the position, shift your body to borrow function." The two are not two states to alternate between. They are one movement, in which rest and action continuously exchange places.
3. The Huanglong Xin koan. "Same-within-different, different-within-same" is older than Hongzhi. He cites his predecessor Huanglong Xin (黃龍新), of the Huanglong (黃龍) branch of the Linji (臨濟) lineage, who offered the image:
*鷺依雪巢，同中有異;烏投黑馬，異中有同。* "A white egret resting in a snowy nest — within sameness, there is difference. A crow landing among black horses — within difference, there is sameness."
Read carefully, the image is precise:
- The egret in snow: white-on-white (same color). Color is the unifying feature, yet the egret is unmistakably not snow — it is a different kind of being, with feathers, breath, alertness. The unifying surface contains within it an irreducible specificity.
- The crow among black horses: crow is not a horse (different kinds), yet its blackness cuts across the difference and momentarily participates in the herd's silhouette. The difference of kind contains within it an accidental sameness that bridges kinds.
Hongzhi's comment — "黃龍老子雖是他宗，甚得吾家之妙" — "Old man Huanglong, though of another lineage, deeply grasped the subtleties of our school" — is significant. The concept is *not* a faction marker. Linji and Caodong, rest-and-function and sudden-uprising, both recognize it. The contemplative eye that sees sameness-and-difference as one movement is bigger than any one school.
4. Natural imagery grounding it in daily life. Hongzhi surrounds the concept with images that return it to the body and the room:
- *戶外有雲從斷徑，座中無照勝然燈* — "Outside, clouds rise from a broken path; inside, lightless seat outshines a burning lamp." (A mind that doesn't cling to brightness still illumines.) - *金雞啄破琉璃卵，玉兔挨開碧海門* — "The golden rooster pecks open the crystal egg; the jade rabbit pushes open the azure sea gate." (Dawn: same moment, two ways of being seen — sound and light interpenetrating.) - And to seal the whole matter, a line from the Avataṃsaka Sūtra (《華嚴經》, the Gandavyuha chapter where Sudhana visits Maitreya): *"佛子住此地，即是佛受用，經行及坐臥，常在於其中"* — "Sons of Buddha dwelling in this ground receive the buddhas' full use: in walking, standing, sitting, lying, they are always within it."
Hongzhi follows with: *"的的縱橫皆得妙，阿儂元自異中來"* — "Vertically and horizontally, all is wondrous; you, ultimately, come from within difference." The point is not an abstract theory. It is meant to be tasted in the breath of an ordinary moment.
Where This Sits in the Buddhist Path of Liberation
This is not a beginner's teaching. The 同中有異 / 異中有同 pairing is for practitioners who have begun to sense that **the world is not sharply divided into "self" and "other," "matter" and "mind," "phenomena" and "principle," yet who also know — either by direct experience in meditation or by honest reflection — that the world's *texture*, its differences and specificities, will not go quietly.** They need a way of seeing that doesn't force the choice.
In doctrinal terms, this belongs to the wisdom side of prajñā (般若, penetrating wisdom). After one has seen, even momentarily, that phenomena are empty of fixed self-nature (a Madhyamaka / 中觀 insight), the question becomes: how do I act, speak, work, relate, without either (a) reifying the emptiness into an inert metaphysical blanket that "everything is one, ultimately," or (b) collapsing back into the conventional world of hard-edged differences as if the glimpse never happened? Hongzhi's paired formula is the contemplative instruction for exactly this in-between.
The Caodong-specific 功位 frame adds: this is not merely a philosophical reconciliation. It is a description of how an awakened life actually works — a life in which wisdom *functions* without effortful self-will, and effortful activity arises without ever separating from the ground.
II. A Walk-Through in Daily Life
To prevent the concept from floating away as poetry, let us walk it through several scenes of contemporary life. In each, I will hold both halves of the pair, and at the end I'll name where popular accounts most often take a wrong step.
Scene 1: A Long Relationship
Two people have been together for years. From the outside, they have the same household, the same routines, the same unspoken grammar of who picks up the groceries. From the inside, each knows the other is irretrievably themselves — a particular history, a particular way of grieving, a particular strange joke only they understand.
- 同中有異 here: The belonging (same household, same years, same bed) contains within it irreducible specificity. The sameness is genuine; it doesn't erase the way she reads slowly while he skims; the way one copes by talking and the other by walking. To respect this is to hold "同中有異" in lived form.
- 異中有同 here: The differences of temperament and history (different kinds) are bridged by a participating sameness — patterns, jokes, the way they read each other's moods. The unity isn't a thing you have; it's the way their differences *inter-are* without wanting to annihilate each other.
Where popular accounts go wrong: Pop spirituality loves the "we are one" side ("our souls are merged"). It talks a lot about 同 and very little about the 異 contained *within* the 同. When a difficult moment arises — a real disagreement, a betrayal of trust — the "we are one" frame is helpless, because it had secretly erased the differences in advance. The mature form of intimacy is not the dissolution of differences into a glow; it is the difference-preserving belonging.
Scene 2: The Question "Am I Still the Same Person I Was Ten Years Ago?"
You look at a photo from a decade ago. You don't recognize your priorities, your body, your sense of humor — and yet something threads through.
- 同中有異: Continuity of self (the same body-ish, the same name, the same strange attachment to old songs) contains within it genuine specificity of who-you-now-are. The sameness of being-you is not the same as being-identical. You are the same; you are different. Both.
- 異中有同: The differences of stage, opinion, circumstance (different kinds of life-phase) are bridged by a thread of continuity (memory, the way the nervous system holds, the residue of choices). The "you" of now is genuinely other to the "you" of ten years ago — yet they are not strangers.
This is the precise form in which Buddhist no-self (無我, anātman) teaching is lived: there is no fixed self-essence standing behind the changes, and yet the changes are not random. Each moment inherits the prior moment and shapes the next, but no "owner" stands over them.
Where popular accounts go wrong: Pop neuroscience sometimes sells "your brain rewires itself completely every seven years, so you are literally not the same person" — which collapses the 同. Pop Buddhism sometimes sells "there is no self, so the question is meaningless" — which collapses the 異 (you have to live as someone, make decisions, keep promises). Hongzhi's formula refuses both.
Scene 3: A Team at Work
A small team has a shared mission ("we are building this thing together"). Each person has a different role, a different angle, a different conflict with another teammate.
- 同中有異: The shared mission (the sameness of aim) does not absorb the functional differences of role, temperament, and priority. The unity of aim respects specialization.
- 異中有同: The role differences (which often become political tribes — design vs. engineering, product vs. sales) are bridged by participating in one outcome. The unity of outcome is not a metaphysical claim; it's the way the differentiated work actually interlocks.
Where popular accounts go wrong: "We're all one team, so disagreements are ego" is a misuse of the 同 side — it silences the 異. The mature organizational form is precisely to allow differentiated function (real disagreement, real specialization) *while* preserving the participating sameness of aim.
Scene 4: Waves on the Ocean (and the Mind)
A beach, late afternoon. Each wave is its own shape and dies in its own way. And every one of them is ocean.
- 同中有異: The ocean (sameness of element) does not erase the wave (specificity of form). The water-ness is one; the wave-ness is many.
- 異中有同: The waves (individual forms) participate in one substance. The differences inter-are.
In the Caodong frame: 功 is the wave's rising and falling, its own shape, its own moment. 位 is the ocean that gives it space. *"Within function, step back into the position; within the position, shift your body to borrow function."* When the wave exhausts its rising (功亡), it is still ocean (就位). When it is ocean (在位), it is the next wave (借功).
Where popular accounts go wrong: The monism cliché ("we are all one") flattens the wave. The pluralism cliché ("every wave is its own thing") forgets the ocean. Hongzhi's *"徹底渾淪無縫罅"* — *completely fused, without a crack* — refuses the false choice.
Scene 5: A Quiet Meditation
You sit for twenty minutes. The mind settles for a stretch into something peaceful and open (the "position"). Then a thought arises — clear, specific, well-formed.
- 同中有異: The settled, luminous awareness (sameness of presence) contains within it the differentiated appearance of the thought. The rest is not blank; the awareness is not blank; the thought is born *within* the awakened openness. To rest in the awareness is not to lose discernment; it is the discernment functioning from within.
- 異中有同: The differentiated thought (different object, different content) is not divorced from the field that knows it. It is one with the knowing without being the knower.
Here Hongzhi's other-worldly imagery becomes exact: *"靈靈了了處，同中有異;湛湛澄澄處，異中有同"* — "In what is clearly aware, there is sameness with difference preserved. In what is purely still, there is difference with sameness preserved." The meditation is a single field in which 靈靈了了 (clear wakefulness — the 功) and 湛湛澄澄 (settled stillness — the 位) are not two states but one movement. This is why his silent-illumination teaching (默照禪) is so supple: it is not "stop thinking and stay silent" — it is to let the silent and the illuminating be one.
Where popular accounts go wrong: A common misreading trains one to think that "advanced meditation is resting in pure awareness, no thoughts." That is collapsing to the 位 side and starving the 功. The mature form is rest-and-illumination interpenetrating. Similarly, "advanced meditation is brilliant clarity, watching everything arise" can starve the 位. The path is the in-between movement.
Scene 6: A Mother Watching Her Child Grow
A child develops a mind of their own. The mother sees familiar gestures, recognizable traits — and a person who is genuinely other to her.
- 同中有異: Belonging (genus, family, imprints) contains within it the differentiation that is the child's own emergence. The belonging was the ground in which the differentiation could appear.
- 異中有同: The child's difference (their own life, their own preferences, eventually their own secrets) is bridged by participating in the long history of care given. Neither identical nor abandoned.
This is also a teaching about suffering: parents who grip the 同 ("you are mine, an extension of me") cause harm. Parents who grip the 異 ("you must become your own person, immediately, my way") also cause harm. The mature holding is both at once.
Scene 7: Algorithms We Live With
You notice that the recommendation system treating you and your friend — same algorithm, same architecture — produces two completely different feeds. Or: every modern language model in a given class shares a base architecture and differs wildly in fine-tuning.
- 同中有異: The shared architecture (sameness of design) does not erase the specific behavior of each instance. The form contains within it the differentiation of training, data, use.
- 異中有同: The differences of fine-tuned behavior are bridged by their participating architecture. Two ostensibly different behaviors are intelligible only against the shared base.
This is not a metaphysical proof of anything — but it is a striking contemporary image of how structural *sameness* and behavioral *difference* can interpenetrate. Notice, however, the limit: this image illustrates structure, but it does not exhaust the human/existential sense. The sameness-with-difference in a real life is not the same as the sameness-with-difference in a software class. Let the analogy illuminate; do not let it become the teaching.
III. Why Contemporary People Need This
There is a structural reason this formula feels timely.
The contemporary mind lives in a peculiar oscillation. On one side, there is an enormous cultural pressure toward monism — "we are all one," "humanity is one," "love dissolves all boundaries," "consciousness is one field," "ultimately everything is energy." On the other side, an equally strong pressure toward pluralism and fragmentation — "every self is its own universe," "every identity is its own truth," "every perspective has its own validity," "no narrative is bigger than any other." Both halves of the paired formula — the 同 and the 異 — have been absolutized on their own and have lost the capacity to interpenetrate.
In practical life, this oscillation produces two distinct miseries.
The monistic miseries: loss of boundaries in relationships; a vague, swelling love-talk that has no traction with the actual person in front of you; an inability to allow real conflict; a passive, undifferentiated gentleness that cannot bear strong differentiation. Spiritual bypassing dressed up as unity.
The pluralistic miseries: brittle self-enclosure; difficulty holding any bigger frame than one's immediate preferences; chronic loneliness in the middle of crowds; the inability to inherit anything from those who came before or to give anything to those who will come after. Curatorial identity that has nothing to participate in.
Hongzhi's paired formula is built for exactly this condition. It is not asking the practitioner to *balance* sameness and difference (a middle-ground compromise, which preserves them as two). It is asking the practitioner to see through to where they interpenetrate as one movement. That seeing is a different cognitive and emotional posture than either of the two absolutes.
In the realm of contemplative practice itself, the formula is also timely. Many practitioners today approach meditation in one of two ways:
- A subtle suppression mode — striving for "pure awareness," a quiet glow, which is collapsing to the 位 and losing 功. - A subtle agitation mode — striving for high-bandwidth insight, more noticing, more clarity, which is staying in 功 and losing 位.
The 默照 (silent illumination) teaching — and *同中有異 / 異中有同* is its structural principle — is the path that refuses both. It is the path of *sameness that contains differentiation* and *differentiation that participates in sameness*, walked in real time, breath by breath.
In short: contemporary life over-salutes one half of the pair and pretends the other half isn't there. The mature contemplative life walks the pair as one.
IV. Common Misreadings and Clarifications
Let me lay out the most common misreadings and correct them carefully, because many of these circulate widely.
Misreading 1: "It means everything is really the same underneath."
This collapses the 異. The classical teaching is not "below the surface, everything is identical." It is that *sameness-with-difference* is the actual structure — the surface is not a deception over a flat unity. The egret in snow is genuinely not snow, even while sharing color; the wave is genuinely not the ocean, even while being water. To read it as flat unity is to drop the second half of the pair and end up with the monism that Hongzhi's koan image is explicitly designed to *prevent*.
Misreading 2: "It means everything is really different and the apparent sameness is just our label."
This collapses the 同. The classical teaching is not "phenomena are discrete, and our labeling creates false unities." It is that *differences are themselves crossed by participating samenesses* — color across kinds, function across stages, the thread of memory across decades. The crow-horse image is exactly here to show that the differences of kind are bridged by an accidental but real co-coloring. Reading the teaching as pluralism forgets the second half of the pair.
Misreading 3: "It's a balance between two opposites."
This treats sameness and difference as two things to average out. They are not opposites. They are nested and interpenetrating. *"徹底渾淪無縫罅"* — completely fused, without a crack — is the explicit instruction. The whole point of the 功位 frame is that they *exchange places inside one movement*, not that one should be calibrated against the other.
Misreading 4: "It's a philosophical puzzle about metaphysics."
It can read that way, especially in English. But in Hongzhi's hands it is not metaphysics — it is training in how to look. He seals the whole teaching with the Avataṃsaka line about *walking, standing, sitting, lying* — and with the verse *"阿儂元自異中來"*, "you, ultimately, come from within difference." The formula is meant to be *tasted* in the texture of an ordinary day, not opined about as a thesis.
Misreading 5: "Following Hongzhi, this is essentially about Silent Illumination (默照禪) and the fixity of the undifferentiated ground."
This is a partial reading. The 靈靈了了 / 湛湛澄澄 pairing in the formula is exactly the awake-still dual-aspect of silent illumination — but *the formula explicitly includes 功 (active, differentiating function) inside the rest*. Silent illumination, in Hongzhi, is not stillness alone. It is "the stillness that illuminates and the illumination that is still," and *同中有異 / 異中有同* is the rule by which they interpenetrate. Forgetting the 功 side turns his teaching into the very disease his teaching cures.
Misreading 6: "It's a Caodong-specific doctrine."
Hongzhi himself rejects this. He cites Huanglong Xin (a Linji-line figure) and says he *"deeply grasped our school's subtleties."* The formula is a contemplative recognition available to any lineage that values both resting and engaging. Treating it as faction armor is a betrayal of its substance.
Misreading 7: "The 功 and 位 are two stages to graduate through."
They are not stages. They are dynamic aspects of one movement. *"功中退步就位，位裏移身借功"* — Within function, step back into the position; within the position, shift your body to borrow function. Stepping back and stepping forth is the *one* movement seen from two sides, not a curriculum. When beginners read it as a ladder, they postpone the actual practice into some future stage. Hongzhi's instruction is immediate: *right now*, function is grounded in position; *right now*, position expresses through function.
A Closing Word
The formula *同中有異 / 異中有同*, in Hongzhi's hands, is not a clever insight. It is a contemplative craft tool — used in the actual workshop of attention, breath by breath, scene by scene, relationship by relationship. Its teaching is simple to state and difficult to internalize: nothing genuinely belongs to anything without also remaining its own thing; nothing genuinely is its own thing without also participating in some larger ground.
Held as one movement, the formula dissolves a great deal of the friction that wears the contemporary contemplative life. It is the patient instruction of a skilled Chan teacher who knew, from sitting and from many years with students, that this is the kind of seeing that does not run out.
Let me end with Hongzhi's own closing gesture, because it places the whole teaching in the room where you are right now:
*Walking, standing, sitting, lying — always within it.* *Vertically and horizontally, all is wondrous; you, ultimately, come from within difference.*