亡羊补牢

The story appears in the Chu Strategies section of the Zhanguo Ce, in the context of political counsel. A man keeps sheep in a pen. The pen has a hole in its wall. One morning he discovers a sheep is missing — escaped through the hole. His neighbor advises him: mend the hole. The man does not act.

The next morning, more sheep are gone. This time the man mends the hole. A second neighbor — or the same neighbor, in some versions — tells him: you have lost your sheep already. What is the point now?

The first neighbor answers on his behalf:

亡羊而补牢，未为迟也。

Mending the pen after losing the sheep — this is not too late.

The original context in the Zhanguo Ce is a piece of political advice. A minister is counselling a king who has already made a strategic error. The king's instinct, and the instinct of his other advisors, is that the damage is done — there is nothing to be gained from remediation. The minister uses the sheep pen story to argue the opposite: the time to repair is always now, never before the loss (because there was no obvious reason to act) and never after it would be too late to act (because it is always too late to do nothing).

This framing is important. 亡羊补牢 is not a story that criticizes the man for failing to prevent the loss — there is no indication he knew the pen had a hole before the first sheep disappeared. The criticism, such as it is, falls on whoever argues that it is too late to act after the loss. The Chinese idiom tradition almost universally treats 亡羊补牢 as approval of the remedial action, not condemnation of the original failure.

The story's moral is sometimes misread as a criticism of delay — as if the point is "you should have mended the pen earlier." This reading turns it into a close relative of 未雨绸缪 (wèi yǔ chóu móu, prepare before the rain), the idiom for prevention before the fact. The two idioms are often paired, but they are making different arguments.

亡羊补牢 is directed at a specific failure that comes after the initial loss: the failure of the fatalist, who says it is now too late to act. The story's answer to the fatalist is direct — 未为迟也, it is not too late. The original failure (not mending the pen before any sheep escaped) is not what the idiom addresses. The idiom addresses the second decision: what to do after you know there is a problem.

This distinction matters for how the idiom is used. When someone cites 亡羊补牢 in response to a setback, they are not criticizing the person who suffered the setback for failing to prevent it. They are arguing against paralysis, against the logic that because something went wrong there is now nothing to be done. The idiom is an argument for remedial action, not a retrospective critique of insufficient foresight.

Its natural pair with 未雨绸缪 covers both phases of crisis management: prepare before the fact if you can, and act decisively after the fact when preparation was not possible or did not work. Chinese proverbial tradition presents both as correct — there is no contradiction between the two idioms, only a sequence.

亡羊补牢 is one of the more colloquially accessible chengyu. The story is simple, the image is concrete, and the phrase is short enough to use naturally in speech. It appears across registers: in official government documents urging institutions to correct identified problems, in management writing, in everyday speech after a personal setback, and in news commentary analyzing a policy response to a crisis.

The fixed phrase 亡羊补牢，为时未晚 (wáng yáng bǔ láo, wéi shí wèi wǎn — mend the pen after losing the sheep; it is not yet too late) is so well established that the second half can be omitted and the listener supplies it. This compression is a mark of how thoroughly the idiom has entered common speech.

The idiom is almost always used approvingly or encouragingly. Saying to someone 亡羊补牢，为时未晚 after a setback is an act of encouragement: the damage is not permanent, there is still time to act, the right response is to repair rather than despair. It is rarely used sarcastically.