Peter wants to REMIND.

Repetition. 3:17; 1Th 3:4; 4:2; 2Th 3:7; 1Joh 2:21; [all the NT is a reminder of what had been delivered. Jude 3-5]

Exploiters. 2:3; Acts 20:29; Mat 7:15; Eph 5:6; Col 2:8; 1Jo 4:1.

Mindful of words. 3:1-2; Jude 1:17.

Imposters. 2Tim 1:6; 3:1-17.

Neglect not. 1:9; 1Tim 4:14; Heb 2:3; 12:5. Jas 1:24-25; Mark 8:14-21.

Death of Apostles predicted. 13; John 21:18-19; 2Thess 2:7; Acts 20:29.