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