Commentaries:
The apostle says false prophets have "eyes full of adultery." While this may apply literally, it can also more generally describe unfaithfulness—a willingness to abandon an agreement if they feel it is in their interest to do so. They also worry little about resisting sin. Their hearts are especially trained in covetousness, and like Balaam, they are willing to do just about anything for personal gain.
David C. Grabbe
What Is a False Prophet?
Self-indulgence promotes, among other things, attitudes of fanaticism, false security, presumption, and fun-seeking. Fanaticism is unbridled obsession, and though most do not recognize it as form of self-indulgence, it is a gratification of selfish desire. The apostle Paul says that we should avoid those who are driven by lust and greed and have no self-control.
Martin G. Collins
Overcoming (Part 8): Self-Indulgence
Other Forerunner Commentary entries containing 2 Peter 2:14:
Galatians 1:6
Revelation 6:9