It is also the Han Dynasty. There was a doctor in the Western Han Dynasty who sealed the Five Classics, namely, Poetry, Calligraphy, Ceremony, Book of Changes, Spring and Autumn Period and Five Classics. Yue has been lost, so the Book of Rites contains Yue Ji, which has a good interpretation of music. All doctors specialize in teaching the Five Classics. Otherwise, cut it open and say it like mutton. That's it. As a result, a doctor named Zhen Yu, who is also a doctor of the Five Classics, saw this situation and didn't scold anyone. He immediately took aim at the one who might be a little sick, that is, the thinnest one, and he took it away. After taking it away, everyone saw this scene, and some people took it away as the thinnest. Sorry, everyone took it back. You are noble! That would be trouble. So we must lay a good foundation first, and then he can change his life as soon as he hears someone's advice. At present, there is no basis for filial piety, faithfulness, courtesy, honesty and shame, and there is no basis for "I am afraid of fame and profit, and I am overjoyed" in Disciples' Rules. Even if someone is willing to persuade him in this life, it may not be able to persuade him. Therefore, it is very important to take root at the grassroots level and do things.