The saying that a beautiful jade will defile itself means that the flaws of a beautiful jade cannot cover up its beauty. The idiom "beautiful jade pollutes itself" comes from "Zuo Zhuan: The Twenty-eighth Years of Duke Zhao". The original text is: "The flaws of a beautiful jade cannot cover up its beauty." This idiom means that there are some flaws on a piece of beautiful jade, but these flaws cannot cover up the brilliance of the beautiful jade. It is a metaphor that people have shortcomings, but their advantages are still worthy of praise. In daily life, people will use this idiom to describe a person's qualities or abilities that, although they have some shortcomings, are generally worthy of recognition and praise. This idiom can also be used to persuade others to see the advantages of others and not to completely deny a person because of some shortcomings.