Wittgenstein’s ten classic sayings are as follows:

1. The meaning of the world must lie outside the world.

2. Causality is the biggest superstition in the world.

3. A suspicion that doubts everything is no longer doubtful.

4. Don’t play with things that are buried deep in other people’s hearts.

5. A person can see what he has, but he cannot see what he is.

6. When you say "no", be like a wall, not like a door.

7. Don’t rely on other people’s examples as a guide to your life.

8. Not deceiving yourself is the hardest thing in the world.

9. What can be said is unnecessary; what must be said is exactly what cannot be said.

10. There is a gap between the order and the execution of the order, which must be filled by understanding.