When three people are walking together, there must be my teacher; choose the good ones and follow them, and change the bad ones.

There is a famous saying in ancient my country: "Three people are walking together, there must be me." "Master Yan" tells us to be humble; and Confucius's sentence "When you see a virtuous person, think about it; when you see a virtuous person, you should introspect yourself" also illustrates this truth.