What Confucius said became the motto of Confucian self-cultivation later.

Confucius said: You should not introspect yourself when you see the sage Si Qi.

When you see someone who has more advantages than yourself in a certain respect, you should consult modestly, study hard, try to catch up with him and reach the same level as him; When you see a person has some shortcomings or deficiencies, you should reflect calmly and see if you have them.

This is what Confucius said, and it is also the motto of Confucian self-cultivation in later generations. "See Si Qi" is a good example to shock you and drive you to catch up; "Reflection after seeing the bad guys" is a bad example to "teach" you. You should learn from it and don't fall with others. Mencius' mother moved three times for fear that Mencius would be influenced by bad neighbors. Du Fu boasted in his poems that "Li Yong is eager to learn knowledge and is willing to be a neighbor", which shows the role of this "example" ~