During the Eastern Han Dynasty, there lived a man named Chen Shi. Whenever people had disputes, they would invite Chen Shi to mediate and ensure fairness, as everyone knew he was an honest, sincere, and kind-hearted person whom everyone respected and listened to.

One year, a famine struck Chen Shi's hometown. Many people lost their jobs; some left to find work elsewhere, while others, due to a lack of employment, turned into thieves, specializing in stealing from others. One night, a thief sneaked into Chen Shi's house, planning to steal things after Chen Shi went to sleep. The thief didn't know that Chen Shi had discovered him hiding on the roof beam. However, Chen Shi pretended not to notice, calmly sitting in the living room and drinking tea.

After a while, Chen Shi called his entire family to the living room and said to them, "You know, human life on this earth is very short, only a few decades. If we don't seize the time to work hard, it will be too late when we get old. Therefore, we should cultivate good habits of striving for improvement from a young age, so that when we grow up, we can make good contributions to society, our families, and ourselves! Of course, there are also some people who are not diligent and only enjoy life. Their nature is not necessarily bad, but they haven't developed good habits, which leads them to do harmful things to society. Now, look up above your heads; the gentleman on our roof beam is a living example."

Upon hearing this, the thief was terrified and quickly climbed down from the beam, kneeling before Chen Shi. "Mr. Chen, I'm sorry! I know I was wrong, please forgive me!" Chen Shi did not scold the thief; instead, he spoke to him kindly and compassionately, "I don't think you are a bad person. You might have been forced by hardship. I will give you some money now. Please don't steal anymore. Work hard, and as long as you can correct your mistakes, you can still become a useful person!"

The thief, moved to tears, said to Chen Shi, "Thank you, Mr. Chen! I will definitely work hard!" Later, the thief indeed changed his bad habits, worked diligently, and became a highly praised young man. Subsequently, Chen Shi's words became the idiom "梁上君子" (liáng shàng jūn zǐ), which is used to refer to a thief who steals other people's belongings.