2) Doubt is the beginning of thinking and the end of learning. -Confucius
3) suspicious, never learned; Learning requires doubt. -Zhang Zai
4) In people's heart, there is a deep-rooted need to be a discoverer, researcher and explorer. This demand is especially strong in children's spiritual world. -Suhomlinski
5) Asking questions is the first step towards philosophy. -Diderot
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6) You can't see the truth without doubt. -Li Siguang
7) People who don't ask are always ignorant. East Africa
8) Questioning customs from all aspects is an inevitable development stage for everyone with high ideological level. Emerson
9) The key to all science is the question mark. -Balzac
10) those who study without doubt must be taught to have doubts, and those who have doubts will have no doubt. Only here can they make progress. -Zhu
1 1) The ear has no bottom and can be heard from morning till night. -Africa