Watch out for false prophets! They dress up like sheep, but inside they are wolves who have come to attack you. You can identify them by their fruit, that is, by the way they act. Can you pick grapes from thornbushes, or figs from thistles? No, a good tree produces good fruit, and a bad tree produces bad fruit. A good tree cannot produce bad fruit, and a bad tree cannot produce good fruit. Every tree producing bad fruit will be chopped down and burned. Thus, in the same way you can identify a tree by its fruit, so too you can identify people by their actions. By their fruit you will recognize them.