1. Being lazy to think, unwilling to delve into and understand deeply, being complacent or satisfied with trivial knowledge are all causes of intellectual poverty. This kind of poverty can be called "stupidity" in one word.

2. Thinking is the self-talk of the soul.

3. The development of the thinking world, in a sense, is the continuous getting rid of surprise.

4. It is better to suffer and stay awake; it is better to endure pain and think than not to think.

5. Knowledge is real knowledge only when it is obtained through active thinking rather than through memory.

6. Spending time thinking is the most time-saving thing.