1. People should be sincere if they are sincere (Cheng Yi)

2. Nothing hurts more than being faithless (Fu Xuan)

3. If you are sincere, the stone will open the door (Wang Chong)

Example

In ancient Ceng Zi, people were honest. One day, his wife went to the street, and Ceng Zi's son wanted to go with his mother. Zeng's wife coaxed him into coming back and killing pigs for him. When she went home on the street, she saw that Ceng Zi was going to kill the pig, and she quickly dissuaded her. Ceng Zi said, "How can you lie?" He killed the pig.