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Di Tian Sui Ch.17 — On Flourishing and Declining (衰旺論)

Di Tian Sui 滴天髓 · Chapter 17 · Translation and Commentary

衰旺論

This is the chapter that separates readers who have memorised rules from readers who can actually read a chart. Its claim is counter-intuitive: the stronger a chart becomes, the less you are permitted to weaken it — and the weaker it becomes, the less you are permitted to strengthen it. Everything else in strength assessment is downstream of this paragraph.

The original text

旺則宜洩宜傷，衰則喜幫喜助，子平之理也。然旺中有衰者存，不可損也。衰中有旺者存，不可益也。旺之極者不可損，以損在其中矣，衰之極者不可益，以在其中矣。至於所當損者而損之反凶，所當益者而益之反害，此中真機皆能知之，何難於立命之微奧乎。

Translation

Sentence 1

旺則宜洩宜傷，衰則喜幫喜助，子平之理也。

When the Day Master is flourishing, it should be drained and should be harmed; when the Day Master is declining, it welcomes support and welcomes reinforcement — this is the principle of Zi Ping.

Sentence 2

然旺中有衰者存，不可損也。衰中有旺者存，不可益也。

Yet within flourishing, a declining element persists, and it must not be damaged. Within decline, a flourishing element persists, and it must not be augmented.

Sentence 3 — the hinge of the chapter

旺之極者不可損，以損在其中矣，衰之極者不可益，以在其中矣。

At the extreme of flourishing, one must not drain it — because the draining is already contained within. At the extreme of decline, one must not reinforce it — because [the reinforcement] is already contained within.

Sentence 4

至於所當損者而損之反凶，所當益者而益之反害，此中真機皆能知之，何難於立命之微奧乎。

As for damaging what ought to be damaged, yet damaging it brings misfortune; reinforcing what ought to be reinforced, yet reinforcing it brings harm — if one can truly know this inner mechanism, what difficulty remains in the profound secret of establishing a life?

On the reading of 以損在其中矣. The phrase is elliptical: it does not say the draining is absent, it says the draining is already present. A chart at peak strength carries its own exhaustion inside it — the very force that made it strong is what will consume it. Adding a drain does not correct the chart, it delivers the coup de grâce to a structure that was about to turn on its own. This is why the same operation is correct at moderate strength and fatal at extreme strength.

The four operations, precisely

Classical term	Rendered here	What it actually does
洩 (xiè)	drain	Draws strength out of the Day Master through its own Output element (食傷). The Day Master spends energy rather than losing it to an attack.
傷 (shāng)	harming	Attacks the Day Master through the Officer / Seven Killings axis (官殺). The Day Master loses energy under pressure. Distinct from 害 (Six Harms).
幫 (bāng)	support	Same element as the Day Master (比劫) — parallel force, structurally equal, adds volume.
助 (zhù)	reinforce	The element that generates the Day Master (印) — Resource, adds volume and converts hostile force into support.

Why this chapter matters more than the rule it states

Read carelessly, sentence 1 is a simple heuristic: strong charts get drained, weak charts get supported. Every beginner book in English stops there. Sentence 2 immediately cancels it — strength and weakness are not global properties of a chart, they are local properties that coexist in the same chart.

A chart can be extremely strong in the Day Master and simultaneously contain a declining element that is doing essential work. Drain the Day Master and you do not merely balance the chart, you destroy the component that was holding it together. This is the practical meaning of 旺中有衰者存，不可損也.

Sentence 3 then goes further, and this is the sentence most translations flatten. It does not say use moderation. It says that at the extremes the corrective operation is already happening. Extremes are self-correcting in the direction of collapse. The practitioner's job there is not to intervene but to identify what is already in motion.

Source text: 《滴天髓》, attributed to 劉基 (Liu Ji, 1311–1375), edited by 陳之遴. Public domain, via Wikisource.

Di Tian Sui滴天髓BaZiFour PillarsDay Master strength衰旺