2 Peter 3:1 - Coke's Commentary on the Holy Bible

Your pure minds— Your sincere minds. This seems to be an intimation that their minds were not yet corrupted, either by the false teachers, or by the scoffers. They were through Divine grace pure, or untainted with the evils which he describes; and St. Peter was desirous that they should continue so, 2 Peter 3:17. It was his grand view in both his epistles, to stir up their untainted and sincere minds to remember and attend to what they had learned from the apostles and prophets. See ch. 2 Peter 1:12; 2 Peter 1:1