1. What you have learned on paper will eventually make you realize it, but you will definitely know that this matter must be carried out.
This poem by Lu You means that the knowledge obtained from books is relatively superficial after all. To understand things thoroughly, you must practice it yourself. Practice creates the need for knowledge, and practice also provides the possibility for the formation of knowledge and turns this possibility into reality. This sentence reflects the decisive role of practice in understanding and emphasizes that practice is the source of understanding.
2. Thousands of sails pass by the side of the sunken boat, and thousands of trees spring in front of the diseased tree.
This poem by Liu Yuxi means that there are still thousands of sailboats passing by the capsized ship, and there are thousands of thriving trees in front of the withered trees. Development is an upward movement, and the essence of development is the emergence of new things and the demise of old things. This poem reflects the general trend of the development of things with new things replacing old things.
3. Ask the canal how clear it is, because there is a source of living water.
This poem illustrates that only if the mind is always active and accepts all kinds of different new ideas and new knowledge can we continue to think and have new ideas. Human practice and understanding are never-ending processes, requiring us to constantly emancipate our minds, keep pace with the times, and constantly innovate on the basis of practice.