Their eyes are full of adultery; their desire for sin is never satisfied; they seduce the unstable. They are accursed children with hearts trained in greed.
14. Beguiling, or baiting, unstable souls. By the metaphor of baiting he reminds the faithful to beware of their hidden and deceitful arts; for he compares their impostures to hooks which may catch the unwary to their destruction. By adding unstable souls he shews the reason for caution, that is, when we have not struck firm roots in faith and in the fear of the...
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
Having eyes full of adultery,.... For the seventh command is not only violated by unclean actions, and obscene words, but also by unchaste looks: and so the Jews explain (k) that precept, ""thou shalt not commit adultery", Exo 20:14; you shall not go after your hearts, nor after "your eyes"; says R.