This sentence is almost a household name, which comes from The Analects of Confucius. The original text is: "Confucius said:" In a threesome, there must be my teacher; Choose the good and follow it, and change the bad. Confucius said, "There must be something worth learning from other people's words and deeds. Choose others to study well, see others' shortcomings, reflect on whether they have the same shortcomings, and if so, correct them. "