1. see no evil, don't listen to evil, don't say evil, and don't move if you are evil. From The Analects of Confucius.

2. Goodwill brings happiness, while civilization brings harmony. From Hugo.

3, people learn etiquette, easy and good, difficult and wrong. From Su Xun.

4. It is safe for everyone to be polite, and it is dangerous to be rude. From the Book of Rites.

5, people's courtesy is like fish with water. From Ge Hong.