信 (Xìn) — Trust

Say "shin," falling hard. Eleven appearances across eight chapters, including the first line of Chapter 81 — the last chapter of the book. Conventionally softened into "faith" or "sincerity," and repeatedly given away to a word that belongs to 德.

Locked: 信 → "trust" / "trustworthy." (Not "faith," not "sincerity," not "belief.")

The recurring failure with 信 is not that translators reach for the wrong synonym. It is that the word keeps losing its own chapter to 德 (dé — integrity). Chapter 23 read "when integrity is weak, the system winds down" for 信不足焉，有不信焉 — a line with no 德 in it at all. Chapter 38's 忠信之薄 read "the waning of integrity," dissolving both 忠 (zhōng — loyalty) and 信 into a word that governs neither.

The cost is precision at the exact places the text is most careful. And Chapter 49 proves the two cannot share an English word, because it puts them in one compound: 德信 — integrity is trustworthy. A translation in which 德 and 信 are both "integrity" cannot render the phrase at all.

The character, read slowly — a person beside their word

信 is 人 (rén — a person) beside 言 (yán — speech). The picture is a person standing next to what they said.

The Shuowen Jiezi (~100 CE) glosses it in one word: 誠也. That is usually Englished as truthful, and the gloss repays decomposing rather than translating: 誠 (chéng) is 言 (yán — words) + 成 (chéng — to complete) — words carried through to completion. Not the word matches the fact; the word is made good. The distinction matters, because it means the oldest dictionary definition of 信 points at dependability, not accuracy — the same direction as the character's own picture.

That is already more specific than "faith," but the decisive detail is elsewhere in the word's early use. 信 also names a 符契 (fú qì) — a split tally: a token broken in two, one half held by each party, so that the halves can later be matched. A messenger carried a 信. A credential was a 信.

So 信 is not a warm inner disposition. It is a correspondence that can be checked — word against deed, half against half. The question 信 asks is not do you feel sincere but does it match.

Hold that against the two conventional renderings and both fall away. Sincerity lives entirely inside a person and is unfalsifiable; you can be sincerely wrong, and sincerely unreliable. Faith is belief held without verification — the precise opposite of a tally. 信 is the tally.

The evidence — a closed loop, not a virtue

It returns exactly what it is given. The same seven characters close Chapters 17 and 23:

信不足焉，有不信焉 where trust runs short, there is no trust

No agent is named, and the English must not name one either — because the two oldest commentaries read the consequence differently and both must stand. 河上公 (Héshàng Gōng) reads it as reciprocity: 君信不足於下，下則應之以不信而欺其君也 — "the ruler's trustworthiness is insufficient toward those below; those below respond with untrust and deceive their ruler." 王弼 (Wáng Bì) reads it as emergence, with no second party at all: 夫御體失性則疾病生…信不足焉，則有不信，此自然之道也 — "govern the body and lose its nature, and sickness arises… where trust is insufficient, there is untrust; this is the way of things being so of themselves." Nothing is given back in 王弼's version; the deficiency simply produces its own consequence, the way disease follows a violated nature. (Both chapters read alike as of 2026-08-30; ch 17 had supplied "leaders" and "the people," which took 河上公's side and also ran the failure backwards — 信 is the ruler's reliability, not the ruler's trusting.)

And the near-tautology is the point. 不足 (bù zú — not enough) gives way to 不信 (bù xìn — no trust): a shortfall of trust does not stay partial, it goes to zero. There is no slightly-healthy body in 王弼's analogy either. This is Laozi's ordinary shape — 為者敗之 (29), those who force it ruin it — a consequence, not a punishment. This is Laozi's ordinary shape — 為者敗之 (29), those who force it ruin it — a consequence, not a punishment. Chapter 63 states the mechanism directly: 輕諾必寡信, light promises inevitably run short on trust. Say more than you will do and the tally stops matching.

It is a property of the Tao, not only of people. Chapter 21, of the indistinct thing at the source: 其精甚真，其中有信 — its essence is utterly real, and within it there is 信. The Tao is trustworthy in the tally sense — it corresponds to itself, it does not say one thing and do another. That is why 信 can sit beside 真 (zhēn — real) in the same line without redundancy: 真 is being so, 信 is reliably so.

It is what ritual replaces. Chapter 38's descent runs 道 → 德 → 仁 → 義 → 禮 (the Tao, integrity, humaneness, duty, ritual), and names ritual's arrival as 忠信之薄 — the thinning of loyalty and trust. 薄 (bó) is literally thin, and the chapter ends on the same axis: 處其厚，不居其薄 — dwell in the thickness, not the thinness. Ceremony is what grows over trust as trust wears away.

And the sage extends it unconditionally. Chapter 49: 信者，吾信之；不信者，吾亦信之；德信 — the trustworthy, I trust; the untrustworthy, I also trust; integrity is trustworthy. This is the hardest line in the entry, because it appears to break the tally: the sage's 信 does not wait to be matched. The resolution is that the sage is the half that always matches — reliable regardless of what the other half does. Not naive, and not transactional either.

The lock: what is set aside, and why

"Faith" is the theistic overlay, and an unusually direct one: 信 is the standard word for faith in Chinese Christian and Buddhist usage — 信仰 (xìn yǎng), 信心 (xìn xīn). Importing it here makes Chapter 21's 其中有信 read as there is faith within it, which turns a claim about reliability into a claim about devotion, and installs a believer where the text has only a tally. Fails the hymn test on sight.

"Sincerity" relocates the word from the space between people to the inside of one of them. 信不足焉 is not insufficient sincerity; it is trust that has not been established or has been withdrawn. Sincerity cannot be split, held by two parties, and matched later. (The Shuowen's 誠 is often Englished as "sincerity." Its graph refuses that: 言 + 成 is a word completed, an act, not a feeling.)

"Belief" and "believe" put the word in the head. Chapter 49's sage does not believe the untrustworthy person; the sage remains trustworthy toward them.

"Integrity" belongs to 德 (dé), and this is the error the word actually suffers from. 德 is what a thing has of itself — its own uncoerced power to be what it is. 信 is what holds between two things. One is interior and singular; the other is relational and requires two halves. Chapter 49 sets them side by side precisely because they are different.

A note on the checker. "integrity" is deliberately not on the forbidden list above, and cannot be. Chapters 21, 23, 38 and 49 all contain both 德 and 信, so every legitimate "integrity" for 德 in those chapters would fire as a false error. tools/check_locks.py gates on whether a character is present in the chapter; it cannot express right for that character, wrong for this one, same chapter. This distinction is therefore held by the reader of this entry, not by the tool.

忠 (zhōng — loyalty), treated here

忠 appears twice: 忠信之薄 (38) and 國家昏亂，有忠臣 (18) — when the state falls into disorder, there are loyal ministers. It is 中 (zhōng — centre) over 心 (xīn — heart): the heart held at the centre, not swayed. Render loyalty, and keep it distinct from 信 wherever they stand together — 忠信 is loyalty and trust, two things, not one hendiadys.

The working register

• as a noun → trust (信不足焉，有不信焉 → "where trust runs short, there is no trust," identically at ch 17 and ch 23; 寡信 → "short on trust")
• as an adjective or the person who has it → trustworthy (信者 → "the trustworthy"; 不信者 → "the untrustworthy"; 德信 → "integrity is trustworthy")
• as a verb → trust (吾信之 → "I trust them")
• of words → trustworthy (信言 → "trustworthy words")
• 忠信 → loyalty and trust, always both

Never "faith," "sincerity," "belief," and never the word that belongs to 德.

The tension, closed at Chapter 81 (2026-08-26)

Chapter 81 opens the book's final chapter with 信 used of speech, and there the word leans toward a sense the rest of the book does not need:

信言不美，美言不信 trustworthy words are not pretty; pretty words are not trustworthy

Read with the tally, this is exact: words that match the world are plain, because ornament is added at the seam where the match fails. But 信言 also shades toward true words — 信 as accurate rather than reliable.

Settled: 信言 stays trustworthy words. Two candidates were argued and set aside.

"honest words." English honest has a builder's sense — honest materials, honest weight — that is very close to 王弼's gloss on this line, 本在樸也, "the root lies in the uncarved" (樸, our locked term). But honest is a character trait: it praises the speaker, where 信 describes whether the word holds. And couplet two of that chapter is 善者不辯 — the 善 (shàn — masterful) we fought out of the moral register at ch 79. A virtue word in couplet one drags couplet two straight back into virtue.

"truthful words." Better than honest, because it describes the utterance rather than the speaker, and it mirrors 信言不美，美言不信 exactly. It was proposed on the strength of this entry's own gloss of 誠 as truthful — which, as corrected above, the graph does not support: 誠 is 言 + 成, word completed, not word-matching-fact. The decisive objection is Chapter 21, which sets 真 and 信 in one line — 其精甚真，其中有信 — and needs them distinct: 真 is being so; 信 is reliably so. Truthful collapses them. 真 is also still unsettled, carrying three Englishes (real at 21, authentic at 54, the most solid truth at 41), so lending it out here would be premature.

The remaining discomfort is real and is with the adjective, not the word: trustworthy is four Latinate syllables on a plain noun, in the one line whose content is plain speech. A recast onto the verb — "words that can be trusted are not pretty; pretty words cannot be trusted" — was offered and declined, because it loosens the chiasmus the Chinese holds exactly. Noted, not resolved.

And one thing worth noticing rather than resolving. Chapter 49's sage trusts the untrustworthy, which makes 信 the one term in this glossary that Laozi asks us to extend without the verification the character is built on. Either the sage has moved past the tally, or the sage understands that offering your half is how the matching starts. The text does not say which, and the difference is most of what the chapter is for.