1. Question, rather than question, "Real singers can sing out the silence in people's hearts." —— Chai Jing

2. Those who have no doubts in reading must learn to have doubts, and those who have doubts must have no doubts. This is the only way to make progress. ——Zhu Xi

3. People who don’t ask will always be together with ignorance. ——East Africa

4. You cannot see the truth without doubt. ——Li Siguang

5. If your ears have no bottom, you can hear from morning to night. ——Africa

6. The key to unlocking all science is undoubtedly the question mark. ——Balzac

7. Questioning is the first step towards philosophy. —— Diderot

8. Scholars must first doubt. ——Cheng Yi

9. There is no doubt that there will be doubts in learning. If there is doubt, there will be progress. If there is little doubt, there will be small progress. If there is great doubt, there will be great progress. ——Lu Jiuyuan (Song Dynasty)

10. The spirit of skepticism is an important part of the scientific spirit. ——Zhou Guangzhao

11. A person who is good at doubting does not doubt what others doubt, but doubts what others do not doubt. ——Fang Yizhi

12. A person who is good at asking questions is like attacking a strong tree. He will first understand the easy part, then the easy part, and then explain it to each other for a long time. Those who are not good at asking will do the opposite. ——"Study Notes"

13. Problems are midwives, they can help the birth of new ideas. ——Socrates

14. He who does not doubt when he is doubtful has never learned; learning requires doubt. ——Zhang Zai

15. Doubt is the beginning of thinking and the end of learning. ——Confucius

16. Teachers use doubts, and friends use doubts to resolve. ——Li Xing

17. Thinking starts with questions and surprises. ——Aristotle

18. Asking questions is more important than solving them. ——Einstein

19. Deep in the human soul, there is a deep-rooted need, which is to hope that oneself is a discoverer, researcher, and explorer. In the spiritual world of children, this need is particularly strong. ——Suhomlinsky

20. Questioning customs from all aspects is an inevitable stage of development for every person with a high level of thinking. ——Emerson

21. A person who is eager to ask questions is only five kinds of fools; a person who is ashamed to ask questions will be a fool for life.

——Anonymous