The pollutions of the world; those more gross wickednesses in which most of the world still lieth, 1 John 5:19. Through the knowledge of the Lord and Saviour Jesus Christ; such a knowledge of Christ as brings with it an outward reformation of life, though it do not purify the heart. For that the apostle doth not here speak of those that were rooted in Christ by a saving and heart purifying faith, appears by 2 Peter 2:14, where he calls them unstable souls. They are again entangled therein, and overcome; return to their old sins, yield up themselves to them, and continue in them.
Related Commentaries of 2 Peter 2:20
2 Peter 2:20
20 For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning.