Matthew 7:16-20

16By their fruit you will recognize them [that is, by their contrived doctrine and self-focus]. Do people pick grapes from thorn bushes or figs from thistles?

17Even so, every healthy tree bears good fruit, but the unhealthy tree bears bad fruit.

18A good tree cannot bear bad fruit, nor can a bad tree bear good fruit.

19Every tree that does not bear good fruit is cut down and thrown into the fire.

20Therefore, by their fruit you will recognize them [as false prophets].