[Although] their talk is big, what they say is worthless, and by [offering people] fleshly desires [i.e., sexual gratification], they lead people astray, who are barely escaping from the error of the world.

Therefore, dearly loved ones, since you know about these things ahead of time, be on your guard so that you are not led astray by the error of lawless people, and [thus] fall from your own stability [i.e., your safe or secure position in Christ].