1. Books are like medicine. Good reading can cure stupidity. From the words of Liu Xiang of the Western Han Dynasty. "It means: Books are like medicine. If you read them well, you can cure diseases.

2. Work is accomplished by hard work, and waste is caused by play; actions are accomplished by thinking, and destroyed by casualness. This sentence comes from Han Yu· "Explanation of Learning". It means that academics are specialized due to diligence, and are neglected due to play; virtues are achieved due to independent thinking, and are corrupted due to following the custom.

3. Know what you know, and don't know how to do it. Not knowing is knowing. From "The Analects of Confucius: Weizheng", it means: knowing means knowing, not knowing means not knowing.

4. Reviewing the past and learning the new can be a teacher. Come on. From Confucius' "The Analects", it means reviewing old knowledge to gain new understanding and experience. With this, you can become a teacher? Reviewing the past and learning the new shows that people's new knowledge and new knowledge often come from the past. Developed on the basis of the knowledge learned.

5. Learning without thinking is a waste, thinking without learning is dangerous. It comes from "The Analects of Confucius: Weizheng", which refers to reading without thinking. , you will not be able to use the knowledge of books reasonably and effectively because you cannot deeply understand the meaning of books, and you will even fall into confusion.

And if you just dream without doing real study and research, you will end up being confused. Building a tower on sand will yield nothing. It warns us that only by combining learning and thinking can we learn practical and useful knowledge, otherwise we will have little effect.