1, from Zuozhuan. Twenty-two years of "xianggong", the original text is as follows: no two princes, no promises. The meaning of this sentence is: the monarch's orders are out and out, and it is difficult to stand on your own feet without faith. It means: if people don't keep their promises, they can't stand in society and can't be recognized by others.

2. During the Spring and Autumn Period and the Warring States Period, Qin Shangyang presided over the political reform with the support of Qin Xiaogong. At that time, at a time of frequent wars and panic, in order to establish prestige and promote reform, Shang Yang ordered a 30-foot-long wood to be erected outside the south gate of the capital, and made a promise in public: whoever can move this wood to the north gate will be rewarded with twelve taels of silver.