1. Thinking starts with questions and surprises. ——Aristotle
2. Raising questions is more important than solving them. ——Einstein
3. There is no doubt that there will be doubts in learning, doubts will lead to progress, small doubts will lead to small progress, and great doubts will lead to great progress. ——Lu Jiuyuan Song
4. Problems are midwives, they can assist in the birth of new ideas. ——Socrates
6. Question, rather than question, "A true singer can sing out the silence in people's hearts." ——Chai Jing
9. Deep in the human soul, there is a deep-rooted need, which is to hope that oneself can be a discoverer, researcher, and explorer. In the spiritual world of children, this need is particularly strong. ——Suhomlinsky
10. Questioning is the first step towards philosophy. —— Diderot
11. You cannot see the truth without doubt. ——Li Siguang
12. People who don’t ask will always be together with ignorance. ——East Africa
13. Questioning customs from all aspects is an inevitable stage of development for every person with a high level of thinking. ——Emerson
14. The key to all science is undoubtedly the question mark. ——Balzac
15. 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
16. The ears have no bottom and can hear from morning to night. ——Africa
17. 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
18. The spirit of skepticism is an important part of the scientific spirit. ——Zhou Guangzhao
19. A person who is good at asking questions is like attacking a strong tree. He will first change it, and then he will understand it. After a long time, he can explain it to each other. Those who are not good at asking will do the opposite. ——"Xue Ji"
20. A person who is good at doubting does not doubt what others doubt, but doubts what others do not doubt. ——Fang Yizhi
21. Teachers use doubts, and friends use doubts. ——Li Xing