Definition: A sentence is settled and will not be changed. Metaphors count, never regret.

Allusions: During the Warring States Period, Shang Yang reformed and innovated in the state of Qin. When the new law was enacted, Shang Yang, in order to establish the prestige of the new law, set up a log at the south gate of Xianyang, the capital of the country, and announced: "Whoever can move this log to the north gate will be rewarded with ten taels of gold.

Everyone was surprised that no one dared move. Shang Yang raised the bounty to fifty taels again.

Someone moved it with skepticism, and sure enough, he got the bounty.

Only then did people believe that Shang Yang's words were true.

Shang Yang then issued a new decree.

This idiom means to do what you say and never change.