Don't teach spells easily and don't sell them cheaply. Some people want a famous teacher to drop by (insincerely). As a famous teacher, you should not accept such behavior. Doctors should not take the initiative to knock on the door and ask patients if they can be cured. This is very passive, treating diseases, such as doing business. No amount of money can be passed on to those heartless sons, and their money can't help those ungrateful people!
It means that all walks of life have their own survival rules, which must be observed for a long time. There is room for everything.
Extended data
Taoists practice Buddhism for the purpose of saving the world and helping others. If Taoism is given to an unfaithful and unjust person and they do some heinous things, how can merciful Taoism bear it?
The Tao is not empty, the law is inevitable, the doctor does not knock, and the Tao is not cheap. This is a rule handed down from ancient times, and it is also the experience of many predecessors. Sometimes breaking the rules because of human feelings will break a fate and give birth to a bad fate, and the other party may take more detours. As the saying goes, the law is not empty, and the Tao does not follow human feelings. Give and take.
Children are not filial, even if they cheer, they will not pass it on to them. Ungrateful people will not help them even if they have money. They would rather starve to death than sell their skills and drag out an ignoble existence. No amount of money can be passed on to heartless unfilial sons, nor can it help those ungrateful villains.