In the 13th year of Xiaozong (the first 356 years) and 19th year (the first 350 years), Shang Yang carried out political reform twice. The content of the political reform was "abandoning the mining field, building buildings, implementing the county system, appreciating agriculture and weaving, and implementing the sitting method". When he began to innovate, in order to win the trust of the people, he sent someone to erect a tree in the city and told him, "Whoever can move it to the gate will be given ten pieces of gold." No one in the state of Qin believed it, and later it was increased to 50 gold, so someone carried wood to the city gate and rewarded it with 50 gold. From then on, he announced and carried out the filial piety reform of "moving wood to establish faith". In a poem praising Shang Yang, Wang Anshi in the Northern Song Dynasty compared the importance of keeping promises with "a word is more important than a hundred gold".