"Beware of false prophets who come disguised as harmless sheep, but are really wolves that will tear you apart.
You can detect them by the way they act, just as you can identify a tree by its fruit. You don't pick grapes from thornbushes, or figs from thistles.
A healthy tree produces good fruit, and an unhealthy tree produces bad fruit.
A good tree can't produce bad fruit, and a bad tree can't produce good fruit.
So every tree that does not produce good fruit is chopped down and thrown into the fire.
Yes, the way to identify a tree or a person is by the kind of fruit that is produced."