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This is an exhortation couplet. Although easy to understand, it contains profound philosophy. If the first part is to encourage people to "learn", then the second part is to emphasize the importance of "doing", and "learning" without "doing" is useless. In Song Dynasty, Lu You said in "Reading on a Winter Night": "What you get on paper is too shallow to know." Li said, "If you can't practice a word, you will be empty." This is also the reason. Zhu in Song Dynasty and Wang Fuzhi in Qing Dynasty made the relationship between "knowledge" and "behavior" more clear. Zhu said: "On order, knowing is the first; On the importance, behavior is the most important ",Wang Fuzhi said in Shangshu Yi Yin:" It is not difficult to know, but it is difficult to do. ..... and know also, because of the work of behavior; People who do it don't take knowledge as work. Knowing how to do it has the same effect as knowing how to do it, that is to say, knowing is the means and doing is the purpose. If you don't do something, you won't know the effect, and there is no way to know the difficulty of things. It is inevitable that you will be empty talk.

This book organically combines "knowledge" and "behavior" in easy-to-understand language, giving people a profound feeling.

The artistic characteristics of this Federation are plain writing, unpretentious, appealing to both refined and popular tastes, natural language and endless charm, which won the artistic essence of Meng Haoran's Spring Dawn. Couplets are also neat and natural, have relative significance, and are particularly profound and appropriate, so they have become the masterpieces of exhortation couplets for thousands of years.

The meaning of this famous saying: knowledge always makes people feel too inadequate when used. A lot of things, unless you have experienced it yourself, you don't know how difficult it is.