The origin of the wolf's brush tells us that the authenticity and accuracy of language and information are very important. In the story, in order to protect people's food, the weasel bravely fought against the rampant rodents, but after winning the stage, it died a fair death because of the deviant behavior of the rats. The weasel left a will before he died, asking people to write the truth and facts with its hair, so as not to mistake lies and rumors for facts. This story tells us to be alert to the spread of verbal violence and rumors, because they may distort the truth and lead to wrong behavior and judgment. At the same time, we should cherish those who are willing to stand up and defend justice and truth. Their existence is crucial to social harmony and progress.