When Confucius traveled around the world, many people followed him and wanted to worship him as a teacher. In the state of Lu, there was a man named Shushan Wudi, whose foot was cut off because of breaking the law. After he met Confucius, he followed him all the time, wanting to see Confucius and learn from him.

After he met Confucius, Confucius said, "You didn't do things carefully, and your feet were cut off because of your sin. Even if you find me now, you can't fix it. What's the use? "

Uncle Shan replied without toe: "I just lost my foot because I was not sensible." I found you now because there is something more noble than feet, and I want to save it. There is no place that doesn't cover the sun, and everything is carried by the earth. I originally regarded Master as heaven and earth, but I didn't expect Master to have such an attitude! "

After hearing this, Confucius was very ashamed and said to Uncle Shanwudi, "I was really superficial in Kong Qiu. Why don't you sit down? " Please tell me everything you know, and I will listen very carefully. "

But Shushan ignored Confucius and left.

Confucius said to his disciples, "I made such a big mistake today, how can I judge a person according to his previous good and evil?" People who broke their foot because of mistakes like Uncle Shan's toe are still studying hard to make up for their previous mistakes, not to mention people who are not at fault! We must remember that even if only three people walk together, there must be someone who can be our teacher. We must learn from their advantages and change their disadvantages as our own reference. Only in this way can we make continuous progress. "

Confucianism believes that a person's status is not determined by wealth, but by his moral level and knowledge. To improve one's morality and knowledge, one must keep learning. "Three people must have a teacher" is to see their own shortcomings and admit that everyone has advantages and strengths, which are worthy of respect and learning. Only by learning from others with an open mind can people learn from each other's strong points and promote the continuous improvement of their own moral level.