1. It is the problem that inspires us to learn, practice and observe. -Paul

2. Often problems are raised, but they can't be solved because the internal relations of things have not been exposed. -Mao Zedong

3. Creation begins with problems. Only when there are problems can we think. Only when we think can we solve problems and find independent ideas. -Tao Xingzhi

4. The problem is the contradiction of things. Where there are unresolved contradictions, there are problems. -Mao Zedong

5. The wisdom of life probably lies in asking why everything happens. -Balzac

6. If an article or a speech is important and instructive, you must always ask a question, then analyze it, then synthesize it, point out the nature of the problem and give a solution. -Mao Zedong

7. Doubt can destroy yesterday's beliefs and open the way for tomorrow's beliefs. -romain rolland

8. Reading, beginning to read, unknown and doubtful; Secondly, there is gradually doubt; In the middle, it is doubtful. After this, the doubts are gradually released, and even integrated, and there is no doubt, which is the beginning of learning. -Zhu Xi

9. Asking the right questions is often equivalent to solving more than half of the problems. -Heisenberg

1. In order to understand the truth correctly, we must first doubt it and argue with it. -Novalis

11. I don't have any special talent, but I just like to get to the root of the problem. -Einstein

12. To solve the problem, we must make systematic and careful investigation and research. This is the process of analysis. Asking questions is where the contradiction lies. -Mao Zedong