A mind that dwells nowhere

Section 9 applies the formula to the four fruits of the path — stream-enterer, once-returner, non-returner, arhat — and it does so by asking, of each, whether the person could have the thought I have attained this.

The reasoning is a pun that happens to be true. "Stream-enterer" means one who has entered, and what such a person has actually done is stop entering — stopped being drawn into form, sound, smell, taste, touch, thought. The name describes an entering, and the reality is a not-entering. The formula again: entered the stream — nothing entered — that is why they are called a stream-enterer.

Then the section does something the sūtra rarely does. It stops speaking in the third person, and Subhūti testifies about himself.

This is the strongest form the argument can take, because it is not hypothetical. Subhūti has the attainment; the Buddha has publicly said so; and Subhūti's point is that the moment he thought I have it, the Buddha would stop saying it.

And notice the reason he gives — 實無所行, in truth practices nothing at all. Not that he is modest about his practice. That there is no findable practising, and it is precisely on that ground that the title fits.

Dīpaṃkara is the buddha under whom, in the tradition, the future Śākyamuni received his prediction of awakening — the single most important transaction in his career across all his lives. And the sūtra says nothing was received.

The second question is aimed at something readers of Mahāyāna literature will recognise: the buddha-lands, described in other sūtras in extraordinary sensory detail — jewelled trees, lakes of the seven treasures, birds teaching the Dharma. Adorning one is a bodhisattva's classical work. Here the formula lands on it too, and if you have been following since section 8 you can hear the third step doing its job: that is why it is called adorning. The work is not cancelled. It is the naming that has been adjusted.

應無所住而生其心 — they should give rise to a mind that dwells nowhere at all.

This is the most consequential sentence in the history of Chinese Buddhism, and it is worth knowing why. In the traditional account, Huineng — an illiterate firewood seller — heard a stranger reciting this line in a marketplace, and that was the beginning of everything that became Chan. He later received the robe of the Sixth Patriarch after hearing the same line again. Whatever one makes of the account, the effect on the tradition is not in doubt: the Diamond Sūtra displaced the Laṅkāvatāra as Chan's central text, and it did so on the strength of these ten characters.

What makes it work is the second half. A great many teachings will tell you to let go, to stop clinging, to rest. This one says give rise to a mind — 生其心, actively produce it — that dwells nowhere. Not a blank mind and not a withdrawn one. A mind that arises, engages, does the day's work, and does not land.

Read against section 1, the shape of the course becomes visible. The Buddha dressing, begging in order, eating, washing his feet: that was a mind arising and not landing, shown before it was described. Nine sections later the sūtra puts it in words.

And then, immediately, Mount Sumeru — because the sūtra never lets a good line sit. A body the size of the world-mountain is large because the Buddha calls it no-body. The formula, applied to size itself.

The comparison that follows — fill that many universes with treasure and give it away, and four lines of this sūtra explained to someone else surpasses it — is the sūtra's most repeated device, and it can read as promotional. It is worth taking it as an argument instead.

Everything on the giving side of the comparison is countable. Enormous, unimaginable, and in principle finite: sand can be counted in principle, universes can be counted in principle, treasure can be weighed. What is on the other side is not a bigger quantity. It is the thing that has no fixed nature to be quantified, which section 8 already established is why such merit cannot be measured. The comparison is not much against more. It is measurable against unmeasurable, and no amount of the first reaches the second.

A stūpa contains relics — the physical remains of a buddha, the most venerated objects in the early tradition. Section 12 says that any place where four lines of this text are spoken has the same standing.

Which is, on reflection, consistent with section 5 rather than a departure from it. If the Tathāgata cannot be seen by his bodily marks, then bodily remains are not where he is to be found either. Wherever this sūtra is found, there the Buddha is present — and by this sūtra's own logic, that is not a lesser presence than a relic. It is a more accurate one.