Promise them liberty. The false teachers tried to make it appear that those who followed the ways they were advocating would be free from all irksome restrictions. But the liberty they promised was lawless license, not Christian freedom (see on 2 Cor. 3:17; Gal. 5:13). The great liberty that a Christian should possess — freedom from sin — the deceivers could not offer and did not wish to achieve.
Servants. Or, “slaves.”
Corruption. Gr. phthora (see on ch. 1:4). Phthora conveys the thought of destruction as well as moral filthiness. The false teachers were incapable of helping anyone else onto a higher moral plane, since they themselves were shackled to sensual vice.
Of whom. Or, “by what,” referring to corruption.
Overcome. Or, “worsted,” as in a fight, when the weaker contestant is defeated.
Brought in bondage. Rather, “has been enslaved” (see on Rom. 6:16). Although the false teachers did not know it, sin had defeated them and they had become its abject slaves. How could they offer liberty to others?