In Song Dynasty, Lin Bu's Xin An Lu said, "You can discipline yourself, but you can't arrest people. Too little self-discipline, too few people, too little is not the way to get involved in the world. Therefore, the gentleman blames himself and the villain blames others. "

It means: courtesy, justice and shame can be used to demand yourself, not others. Asking yourself to make fewer mistakes, asking others to get along with others is difficult, and being unsociable is not really the right way of life. Therefore, a gentleman will be strict with himself, and a villain will complain.