There is a kind of people in this world who are called black sheep. There are three changes in this kind of person. The first change is locusts. They will sell all the estates, fields, houses and ancestral businesses left by their ancestors and go to eat, drink and be merry. The second change is called moths, which will sell the rare books of ancient books collected by generations at home and eat, drink and be merry. The third change is that the big worm (that is, the tiger) will sell all the servants and handmaiden around him and eat, drink and be merry. This kind of black sheep did not exist in that generation, because their parents and ancestors did not teach them to learn to read the truth of benevolence and righteousness. The ancients said that it is better to teach children to learn a classic than to leave them a box full of gold. This couldn't be more correct.