15 Beware of false prophets, who come to you in sheep's clothing, but inwardly are ravenous wolves.
16 You shall know them by their fruits. Can grapes be gathered from thorns, or figs from thistles?
17 So then, every good tree produces good fruit, and the evil tree produces evil fruit.
18 A good tree is not able to produce evil fruit, and an evil tree is not able to produce good fruit.
19 Every tree which does not produce good fruit shall be cut down and cast into the fire.
20 Therefore, by their fruits you will know them.