The "Is-Not" Threefold Formula — The Diamond Sūtra's Compressed Formula
5.1 The "Is-Not" Threefold Formula — The Diamond Sūtra's Compressed Formula
Something You Can Hardly Miss When Reading the Diamond Sūtra
The Diamond Sūtra is short. A little over five thousand characters of scripture. But read it through and you notice that the Buddha has an unmistakable habit of speech—not a verbal tic, but a structure that keeps returning.
The adornment of buddha-lands—it is not adornment, therefore called adornment.
The Buddha speaks of prajñāpāramitā—it is not prajñāpāramitā, therefore called prajñāpāramitā.
The Tathāgata speaks of the foremost pāramitā—it is not the foremost pāramitā, therefore called the foremost pāramitā.
Sentient beings, sentient beings—the Tathāgata says they are not sentient beings, therefore called sentient beings.
"The Buddha speaks of X; it is not X; therefore called X."
This formula appears at least eight times across the whole sūtra—and with the abbreviated variants that drop one of the three segments, the density is higher still. It clusters after §10 and reaches its peak in §13 and §17. Its objects climb steadily, from concrete designations at the start—buddha-lands, physical form, dust-motes and worlds—up to the teachings themselves: prajñāpāramitā, the patience pāramitā, even buddha-dharma as such.
This is not the Buddha running short of inspiration. It is the most deliberate pedagogical device in the entire sūtra. A formula short enough to memorize, yet structured deeply enough to carry the doctrine of the whole text. The vast apparatus the earlier parts labored to build—the hundred dharmas, the eight consciousnesses, the five aggregates, emptiness—is here compressed into three segments and nine words.
Try a concrete instance. You hear "the Buddha speaks of the adornment of buddha-lands"—and in your mind there rises a picture of golden radiance and towering halls. The Buddha does not wait for the picture to settle; at once he adds "it is not adornment"—and the picture collapses. Before this "is not" can harden into a different kind of real existence, the Buddha adds again, "therefore called adornment"—the name returns, but this time with no picture propping it up. In the span of three phrases, the mind has been turned over twice.
The question is: compressed into what?
The Tool of the Three Natures
Parts Two and Three introduced the Yogācāra three natures—the imagined nature, the dependent nature, and the perfected nature. Here we need only a brief reminder of how they work.
One object, three ways of seeing. There is a cup before you—a conditionally arisen, temporary existence: this is the dependent nature. To take this cup to be an independent, solid entity with a "cup-ness" of its own: this is the imagined nature. To see it clearly as it truly is—merely a confluence of conditions, without any nature of its own: this is the perfected nature.
The three natures are not three different things. They are one and the same thing as it appears under three states of cognition.
The Saṃdhinirmocana Sūtra uses the image of a diseased eye seeing hairs in empty space. A person with an eye ailment sees hairs floating in the air—the appearance of the hairs is itself the dependent nature. To believe there are really hairs there is the imagined. To see that the appearance of hairs is merely the conditioned arising of an eye ailment is the perfected. The hairs do not change; the way of seeing changes.
The three natures are Yogācāra's compressed formula. The Diamond Sūtra's "is-not" structure is also a compressed formula. Can the two formulas be translated into each other?
Kuiji's Reading
In the seventh century, Kuiji, Xuanzang's foremost disciple, wrote a Commentary on the Diamond Prajñāpāramitā Sūtra—the most precise Yogācāra commentary on the Diamond Sūtra. He did something no one before him had done: he mapped the three segments of the "is-not" structure onto the Yogācāra three natures.
Kuiji's mapping runs like this:
- "Speaks of X" → imagined nature
- "It is not X" → dependent nature
- "Therefore called X" → perfected nature
This reading begins from the listener's side.
The Buddha "speaks of" the adornment of buddha-lands—and in the very instant of hearing, a real, solid image of "adorned buddha-lands" springs up in the listener's mind. That image is the imagined nature. The Buddha then says "it is not adornment"—negating the image, disclosing the adornment of buddha-lands in its dependent nature as a conditionally arisen phenomenon. Finally, "therefore called adornment"—the reified image has been set down, and the word "adornment" can still be used, but now it is used within the perfected nature.
The beauty of Kuiji's mapping is that it captures a process unfolding in time: first you cling, then you release, and finally you use words again within non-clinging. The listener's cognition passes through three stages, and the "is-not" structure is the compressed expression of those three stages.
This is a very powerful blade. After the Tang dynasty, the Yogācāra reading of the Diamond Sūtra begins here. But Kuiji's reading is not the only reading.
Another Angle
Shift the vantage point. Instead of asking about the listener's cognitive process, ask about the dharma the Buddha is speaking of in itself—X as an object: what is its ontological status? Seen this way, the mapping becomes:
- "X" → dependent nature
- "It is not X" → negation of the imagined nature
- "Therefore called X" → re-establishment within the perfected nature
Take "the adornment of buddha-lands" again. "The adornment of buddha-lands" is itself dependent—bodhisattvas really do adorn buddha-lands in dependence on a confluence of conditions; this genuinely happens. What "it is not adornment" cuts away is the "adornment" in the mind: a solid, eternal entity that can be possessed. That thing never existed, so it must be cut. "Therefore called adornment"—the name returns, but this time it is used under a knowing of things as they truly are.
This reading sets out from the structure of the object, not from the listener's confusion.
The two readings agree completely on the third segment—both land on the perfected nature. The divergence is in the first two. Kuiji counts "X" as the imagined nature; the Pointing-at-the-Moon reading counts "X" as the dependent nature.
Is this a contradiction? No.
The same "X," seen from the listener's side, is the imagined nature (because hearing it provokes clinging); seen from the object's side, it is the dependent nature (because it is itself a conditionally arisen dharma). This is exactly what confirms one of Yogācāra's deepest insights: the imagined nature is not an independent thing—it is only a mistaken cognition laid over the dependent nature. Without the dependent nature, there is no ground on which the imagined can occur. The ordinary person sees the imagined upon the dependent; the sage sees the perfected upon the very same dependent.
The two mappings are like the front and back of one mirror. One reflects the listener; one reflects the dharma spoken of. The Diamond Sūtra does both at once—so both mappings are correct, and both are only one angle each.
Look at one more example. That line in §13—"the Buddha speaks of prajñāpāramitā; it is not prajñāpāramitā; therefore called prajñāpāramitā"—unfolds this way under Kuiji's reading. The moment the listener hears "prajñāpāramitā," a real, solid image of "ultimate wisdom" springs up in the mind. It is a thing that can be acquired, held onto, shown off—this is the imagined.
"It is not prajñāpāramitā" negates that image: true prajñā does not work like that; restoring it to its conditionally arisen nature is the dependent. "Therefore called prajñāpāramitā"—the word is usable again, but the one who now uses it no longer treats it as an entity; this is the perfected.
The Pointing-at-the-Moon reading turns the same line the other way. "Prajñāpāramitā" is itself dependent—buddhas speak it in dependence on conditions, sentient beings learn it in dependence on conditions; this genuinely happens. What "is not" cuts away is the clinging that seizes prajñā as an entity. "Therefore called" sets the name back in place within a knowing of things as they are. The same scriptural line, seen from two angles, yields two profile images of one and the same structure.
This is the real depth of the "is-not" structure: it is not merely negating. It is teaching you, all at once, to see the listener clearly, to see the dharma spoken of clearly, and to see the relation between the two.
The First Half and the Second Half Are Not the Same Blade
At §17 of the Diamond Sūtra, Subhūti re-asks the question from §2, almost word for word:
If good men and good women give rise to the mind of anuttarā-samyak-saṃbodhi, how should they abide? How should they subdue their minds?
This is not the Buddha forgetting. This is the fold-point of the whole sūtra. From here the Diamond Sūtra begins to re-perform itself—but at a different depth.
In the first half (§1–16), the objects of the "is-not" formula mostly circle around "self"—the four marks, my adorning of buddha-lands, my giving. This is cutting the afflictive obstruction, the clinging that arises because there is an "I."
In the second half (§17–32), the objects climb: prajñāpāramitā, the patience pāramitā, buddha-dharma itself, the very act of teaching the dharma. This is cutting the cognitive obstruction, the clinging to dharmas.
The same "is-not" formula, but in the first half and the second half it is a different blade. The first half teaches you not to grip buddha-lands so tightly. The second half teaches you not to grip even "not-gripping" so tightly.
The first half is enrollment. The second half is graduation—and graduation means: even the concept of "graduation" must be set down.
This progression runs through the whole of Part Five. Chapters three through six work mostly within the range of the first half—cutting marks, cutting dharmas, cutting merit, cutting abiding. Chapter seven returns to dissect the structure of §17 itself. From chapter eight onward we are in the world of the second half—where even the Tathāgata's physical form cannot be grasped, where even "all conditioned phenomena" are like a dream, an illusion, a bubble, a shadow.
This is where the compressing power of the "is-not" structure lies. The same formula—the Buddha speaks of X, it is not X, therefore called X—can cut the afflictive obstruction and can cut the cognitive obstruction. It can cut the concrete mark and cut the abstract dharma. It can cut another person's clinging, and it can cut your own understanding of prajñā itself.
The formula is short. But the blade is sharp.
A Tool, Not a Cage
We must pause here for a crucial reminder.
The three-natures mapping is an interpretive tool for understanding the "is-not" structure. It is not—and must never become—a cage that domesticates the Diamond Sūtra.
Wittgenstein wrote a famous image in the history of philosophy. The reader must climb the ladder to see the world clearly, and then kick the ladder away—knowing the ladder is not the world is what lets you truly see the world. This passage and the Diamond Sūtra's raft analogy in §6—"even the dharma should be let go, how much more so what is not dharma"—are saying the same thing.
The three-natures mapping is just such a ladder. Kuiji's mapping, the Pointing-at-the-Moon mapping—two ladders. They help a person climb to a certain height and see how the "is-not" structure works. Once up, the ladder is to be set down.
After reading this chapter, the next time you see the "is-not" structure, your mind may instantly apply the template—"speaks of is the imagined, is-not is the dependent, therefore-called is the perfected"—and then feel "I get it." At that moment, the mapping turns from tool into cage. You think you are reading the Diamond Sūtra, but in truth you are only confirming that you can use the vocabulary of the three natures.
The spirit of the "is-not" structure is to keep the mirror alive. The moment it is sealed inside any fixed table of correspondences, the mirror dies.
Both mappings are tools. Use them to cross the river. Once across, set them down.
The next chapter speaks of this: the Diamond Sūtra is not merely a book that argues a point—it is a mirror. With the same "is-not" structure, those who can see, see; those who cannot, cannot. The mirror does not lie.