2. The story of changing books for geese: Wang Xizhi, a book saint, likes geese very much. He thinks that keeping geese can not only cultivate sentiment, but also learn some calligraphy theory from observing the movements of geese. Once Wang Xizhi went out to play and saw a group of beautiful white geese, so he wanted to buy them. When asked, he found that these geese were raised by a Taoist nearby and wanted to discuss with him to buy them. When the Taoist heard that the famous Wang Xizhi wanted to buy them, he said: As long as Wang Youjun can help me copy the Tao Te Ching, I will give him some geese. Wang Xizhi readily agreed to change the book into a white goose.