15Beware of false prophets, who come to you in sheep’s clothing, but inwardly are ravening wolves. 16By their fruits ye shall know them. Do men gather grapes of thorns, or figs of thistles? 17Even so every good tree bringeth forth good fruit; but the corrupt tree bringeth forth evil fruit. 18A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit. 19Every tree that bringeth not forth good fruit is hewn down, and cast into the fire. 20Therefore by their fruits ye shall know them.