This sentence comes from "The Analects" and is a famous saying of Confucius. "Chang" means "once", and the general meaning of this sentence is relatively easy to understand. It means that I once didn't eat all day long and stayed up all night thinking about it. In the end, I found that it didn't do any good, so I might as well study hard.

This chapter is actually a supplement and explanation to the previous chapter. In the previous chapter, Confucius mentioned that learning without thinking leads to waste, and thinking without learning leads to peril. This famous saying that everyone is familiar with describes the relationship between learning and thinking. The two should go hand in hand and support each other. , it is very dangerous to focus on any one point alone. This is a very important educational thought of Confucius. Therefore, in this chapter, Confucius discusses his past experience. If you just dream about it, it is just a waste of time and will not help solve the problem. It is better to learn down-to-earth. It also reflects Confucius’ pragmatic attitude towards education.

This is actually some misunderstandings that many of us have today. Mr. Yang Jiang once said this when answering a reader's confusion when he wrote to her. It probably means that your problem is that you don't read many books, but you think too much. Today, another saying has emerged, thinking too much and doing too little. Young people have relatively little social experience, and they will easily get into trouble when encountering some problems. In fact, it is just that their vision is not broad enough and they are troubled by others. Many problems that may have seemed big to us in the past are actually a little bigger when we look back as time goes by and we become more knowledgeable. Or through extensive reading, you may find that your predecessors have already experienced it in the book, and their experience and wisdom summaries are all there, but you don’t know it.

When we take a longer-term view, read more books, walk more roads, and meet more people, many problems will actually be solved. Learning can bring us energy and nutrition. Most of the great masters in ancient and modern times, both at home and abroad, are very fond of reading. They are even very greedy for learning and knowledge. I have seen more life forms and lifestyles, learned more wisdom from others, and it is easier to see the essence of many things.