During the Northern Song Dynasty, there was a scholar named Zhang Guaiya, a scholar with a straightforward personality and aversion to evil. He was ordered to serve as Chongyang Qijin. After taking office, he found that many of the county officials and other officials were treacherous and dishonest. He wanted to make a good deal of it, but that group of people were all "old officials" who had been working in the county government for a long time. They were cunning and cunning, and they couldn't grasp his price for a while.
One day, Zhang Guaiya led his entourage to inspect various places. When he approached the county warehouse, he found a man coming out of the warehouse in a panic. Zhang Guaiya saw that he was acting suspiciously and shouted:
"Who? Stop!"
The man had no choice but to come forward and kowtow to him, and said:
"This little man is the officer guarding the warehouse. He is going home after get off work."
"Why do you look so panicked when you meet this county?"
"The villain is stupid and timid. He has always been afraid of meeting officials."
Zhang Guaiya saw that he was articulate and did not look like a timid person at all, so he ordered his followers to search him to see if there was any involvement. After searching, the attendant reported back that "there was nothing on him."
At this time, the officer became aggressive and shouted: "Master, you searched me for no reason, how can I ask this villain to work in the warehouse in the future?"
Zhang Guaiya saw that he was being unruly, and he was helpless for a moment. Suddenly, he caught a glimpse of a small coin stuffed under the turban on the guard's temples. He ordered someone to bring it over and asked, "Isn't this the money you brought out from the warehouse?"
The guard sneered, He said: "So what? If I look after the warehouse, scratch my itch with a small amount of money, and fill my headscarf, can it be considered theft by me?" It turns out that the cunning servant stole a penny when he left the warehouse every day, so even if he was caught, it would not be a crime.
Zhang Guaiya became angry and said: "A penny of national property is also theft!" He ordered his men to go to court immediately and beat him twenty times. The officer was very arrogant, and became even more vicious after being beaten:
"Okay! You hit, you hit! Let's see, you can't kill me for a penny!"
Zhang Guiya was furious, He picked up a pen and made a judgment:
"A rope saw can cut it, and a drop of water can penetrate a stone. One penny a day, a thousand penny a thousand days! He will be executed for the crime of stealing from the country (tang, money and property from the treasury)!" After reading the sentence aloud, he drew his sword and killed the officer himself. "One penny a day, a thousand penny a thousand days" later became the meaning of accumulating less to make more and gathering sand to form a tower.

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Baidu entries: Zhang Yong (946-1015), with the courtesy name Guaiya and posthumous name Zhongding, was born in Juancheng, Puzhou (now Juancheng County, Heze City, Shandong Province). Jinshi during the Taiping and Xingguo years. He was promoted to be a Privy Councilor , Zhenzong at that time, he was an official in the Ministry of Rites, and he was excellent in poetry and prose. He was a famous minister in the Northern Song Dynasty, Taizong, and Zhenzong, especially famous for his governance in Shu. His collection of essays is named " Zhang Guiyaji ".