徙木立信 / Moving the Log to Build Trust

徙木立信 / moving the log to build trust is the public-credibility episode 《资治通鉴·周纪》13丨 公孙鞅苛刻变法惹杀身（1） uses before 公孙鞅 / 商鞅 issues the new law. Shang Yang places a three-zhang log at the capital’s south gate and promises gold to whoever moves it to the north gate. When people do not believe the notice, he raises the reward; when someone moves the log, he pays.

The point is not the task itself. The episode reads it as an engineered proof that 秦国’s reform government will honor public rewards and punishments literally. That makes it adjacent to 小信诚则大信立, but with a sharper legalist edge: small credibility is built to prepare society for coercive, high-stakes enforcement.

Key Claims

• Public trust can be built through a deliberately simple, observable transaction.
• A state’s reward promise becomes more believable when it is fulfilled in front of skeptical people.
• Trust is used instrumentally here, as a precondition for enforcing 商鞅变法.
• The story contrasts credibility based on kept promises with legitimacy based on consultation or custom.

Connections

• 公孙鞅 / 商鞅, 秦孝公, and 秦国 - actor and state setting.
• Shang Yang Reforms / 商鞅变法 and Reform Without Popular Deliberation / 不与民虑始 - reform package and political logic it supports.
• Small Trust Builds Large Trust / 小信诚则大信立 - earlier Ruiqi branch on political credibility.
• Legalist Ruler Technique / 法家君术 - adjacent governance-through-enforcement frame.