Jamieson, Fausset & Brown, on 2Pet 2:20

“For if, flying from the pollutions of the world, through the knowledge of our Lord and Saviour Jesus Christ, they be again entangled in them and overcome: their latter state is become unto them worse than the former.”

“after they--the seducers "themselves" have escaped (Pe2 2:19; see on Heb 6:4-6). pollutions--which bring "corruption" (Pe2 2:19). through--Greek, "in." knowledge--Greek, "full and accurate knowledge." the Lord and Saviour Jesus Christ--solemnly expressing in full the great and gracious One from whom they fall. latter end is worse . . . than the beginning--Peter remembers Christ's words. "Worse" stands opposed to "better" (Pe2 2:21).”

Imported from an open dataset — not yet checked against the printed edition.