As a son of a man, when Fang was young, he was close to his teachers and friends and learned etiquette.
If you are four years old, you can make pears. If you are younger than your elder, you should know better.
The first is filial piety and brotherhood, the second is seeing and hearing, knowing a certain number, and knowing a certain article.
One makes ten, ten makes one hundred, one hundred makes one thousand, one thousand makes ten thousand.
It is said that benevolence and righteousness, etiquette and trustworthiness, these five constants cannot be disrupted.