Xiu De is needed to practice calligraphy. The handwriting is like a person, but it is actually a human error that the handwriting is not correct. There are dialectical methods, philosophical knowledge, mathematical geometry knowledge and physical knowledge in calligraphy, so as to ensure the stability of the center of gravity. Needless to say, calligraphy is a whole-body activity, just like practicing Tai Chi. Calligraphy will teach you to discover beauty, appreciate beauty and produce beauty. Calligraphy is not only physical labor, but also mental labor, which needs no explanation.