Beware of False Prophets
Beware of false prophets, who come to you in sheep's clothing but inwardly are ravenous wolves. You will know them by their fruits. Are grapes gathered from thorns or figs from thistles? In the same way, every good tree bears good fruit, but the bad tree bears bad fruit. A good tree cannot bear bad fruit, nor can a bad tree bear good fruit. Every tree that does not bear good fruit will be cut down and thrown into the fire. Thus you will know them by their fruits.
Matthew 7:15-20
Jesus warned of wolves in sheep's clothing and later told the disciples to watch out for the leaven of the Pharisees, teaching that spreads invisibly through the whole loaf.
Jesus' test for teachers is agricultural, not rhetorical: by their fruits. Not by their following, their confidence, or their production quality, but by what their life and teaching actually grow in people over time. Grapes do not come from thornbushes, no matter how the thornbush brands itself.
Audit your inputs, the voices you stream, follow, and absorb, by fruit rather than by polish. And give discernment its full domain: guard what you accept, and be wise about where you offer what is holy.