Yu Xin, an official, opened a room with three divisions.
The general idea is: Only by achieving a high level of literary accomplishment can we improve our appreciation level and personal attainments.
The word "book" and "text" can be understood as the realm in this respect.
When calligraphy reaches the level of Wang Xizhi, it is difficult to produce inferior products. When the article reaches the level of Yu Xin, it can be as relaxed as you wish.
Experience: everything must be savvy, not rote learning. With the growth of age and knowledge, your experience will be different.
Personal point of view