Su Shi's nephews Liu Hong and Liu Ying appreciated his uncle's calligraphy and asked Su Shi for it. So Su Shi wrote two poems to apologize, saying that his calligraphy was not cherished enough. Only studying thousands of books is the realm that students should pursue. The epigram "Only when you read thousands of books can you understand the spirit" is a common language used by the ancients to persuade students to learn, and it is an integral part of our national cultural heritage. Du Fu also said, "Reading is like writing." This slogan, which calls for extensive reading, still has its practical significance in today's knowledge explosion, increasingly detailed social division of labor and narrower professional scope.