Mark Twain's famous sayings are:

1. The strong despise difficulties, the weak look up to difficulties.

2. When you find that you belong to the majority, you should stop and reflect.

3. Never argue with stupid people, they will drag you down to their level and then get back at you.

4. Among all fragile things, the most fragile is morality that has not been tested in fire.

5. Everyone is like a moon, unwilling to let others see their dark side.