16. You can tell what they are by what they do. No one picks grapes or figs from thorn bushes.
17. A good tree produces good fruit, and a bad tree produces bad fruit.
18. A good tree cannot produce bad fruit, and a bad tree cannot produce good fruit.
19. Every tree that produces bad fruit will be chopped down and burnt.
20. You can tell who the false prophets are by their deeds.