You do good and what you get back is evil. As soon as he got out, he started butting with his horns.
Nature is to the grave.
People's nature doesn't change ever. Don't expect a bad person to suddenly turn good. . Hurimat minnak el-ta'liyah. Oh you who are trying to get samnah from the breast of an ant, you won't be able to fry anything. Said to someone who is really stingy.