15"Beware of false prophets, who come to you in sheep's clothing but inwardly are ravenous wolves. 16You will recognize them by their fruits. Are grapes gathered from thornbushes, or figs from thistles? 17So, every healthy tree bears good fruit, but the diseased tree bears bad fruit. 18A healthy tree cannot bear bad fruit, nor can a diseased tree bear good fruit. 19Every tree that does not bear good fruit is cut down and thrown into the fire. 20Thus you will recognize them by their fruits.