Don’t get your doctrine from false teachers

Bold and willful, they do not tremble as they blaspheme the glorious ones, whereas angels, though greater in might and power, do not pronounce a blasphemous judgment against them before the Lord. But these, like irrational animals, creatures of instinct, born to be caught and destroyed, blaspheming about matters of which they are ignorant, will also be destroyed in their destruction, —2 Peter 2:10-12 ESV

John Piper, in a sermon on 2 Peter 2:

Verse 12 adds that the false teachers are like animals in two senses. First, they are utterly ignorant of what they speak. Their reviling at the glories of Christ is like a wolf howling at the sunrise. And, second, they will be destroyed like the animals. They will come to and end in judgment, and all their howling will be silenced. We are admonished, therefore, to beware of spiritual pride. As Paul says, “Let anyone who thinks that he stands take heed lest he fall” (1 Corinthians 10:12). We are utterly dependent on the grace of God and dare not boast in any self-sufficiency.