For it had been better for them not to have known the way of righteousness, than, after they have known it, to turn from the holy commandment delivered unto them.
This is a warning to all in the fuure who would think they can falsely become a preacher and lead people astray and not suffer eternal consequences. Preachers of God are under a heavy requirement by God and they must shepherd the flock according to GOD'S WORD or face serious consequences..