1. You cannot lose faith, and you cannot destroy that great love because of doubt. "Noble Love" by Sienkiewicz, a century-old Polish writer?

2. A good questioner is like attacking a difficult tree. First he can change it, and then he can understand it. After a long time, he can explain it to each other. Those who are not good at asking will do the opposite. Le Zhengke·Warring States Period's "Xue Ji"

Translation: A person who is good at asking questions is like attacking a hard wood. He starts with the easy part first, and then he becomes more self-conscious. As time goes by, the harder parts will also be attacked. Falling off and breaking down. People who are bad at asking questions are the opposite.

3. You cannot see the truth without doubting. Modern·Li Siguang's "Introduction to Geological Mechanics"

4. Questioning customs from all aspects is an inevitable stage of development for every person with a high level of thinking. "On Nature" by Emerson, United States

5. Those who have no doubts in reading must be taught to have doubts; those who have doubts must have no doubts. Only by reaching this point can we make progress. Song Dynasty Zhu Xi's "Explanation of Tongshu"

Translation: Those who read without doubts, those who teach should have doubts, and those who have doubts must have no doubts. Only here can they make progress.