If indeed they have escaped the corruption of the world through the knowledge of our Lord and Savior Jesus Christ, only to be entangled and overcome by it again, their final condition is worse than it was at first.
20. For if after. He again shews how pernicious was the sect which led men consecrated to God back again to their old filth and the corruptions of the world. And he exhibits the heinousness of the evil by a comparison; for it was no common sin to depart from the holy doctrine of God.
The apostle's design being to warn us of, and arm us against, seducers, he now returns to discourse more particularly of them, and give us an account of their character and conduct, which abundantly justifies the righteous Judge of the world in reserving them in an especial manner for the most severe and heavy doom, as Cain is taken under special protection that he might be kept for uncommon vengeance.
Commenting on 2 Peter 2:10-22
For if after they have escaped the pollutions of the world,.... The sins of it, the governing vices of it, which the men of the world are addicted to, and immersed in; for the whole world lies in wickedness, and which are of a defiling nature: the phrase is Rabbinical; it is said (q), "he that studies not in the law in this world, but...