What are the classic famous sayings that can't be done?

1. People who break their promises can't be respected by others, especially men.

A person should keep his promise, not break his word, but keep his word, so as to gain the trust of others.

He speaks with a spear, which contradicts himself. I don't know what the conclusion is.

4. A giant who speaks, a dwarf who acts.

5. Commitment is like a pearl. Its glory is the price of mussels' pain and the glory of mussels. Please don't promise if you can't do it.

6. Commitment is the foundation of life and career.

7. Don't promise when you are happy, don't answer when you are sad, don't make a decision when you are angry, think twice before you act wisely. When you keep saying that you are busy, you will never get space; When you keep saying that you have no time, you will never get time; When you keep saying that you will do it tomorrow, your tomorrow will never come.