2 Peter 3:15

account . . . the long-suffering . . . is salvation--is designed for the salvation of those yet to be gathered into the Church: whereas those scoffers "count it (to be the result of) slackness" on the Lord's part (Pe2 3:9). our beloved brother Paul--a beautiful instance of love and humility. Peter praises the very Epistles which contain his condemnation. according to the wisdom given unto him--adopting Paul's own language, Co1 3:10, "According to the grace of God which is given unto me as a wise master-builder." Supernatural and inspired wisdom "GIVEN" him, not acquired in human schools of learning. hath written--Greek aorist, "wrote," as a thing wholly past: Paul was by this time either dead, or had ceased to minister to them. to you--Galatians, Ephesians, Colossians, the same region as Peter addresses. Compare "in peace," Pe2 3:14, a practical exhibition of which Peter now gives in showing how perfectly agreeing Paul (who wrote the Epistle to the Galatians) and he are, notwithstanding the event recorded (Gal 2:11-14). Col 3:4 refers to Christ's second coming. The Epistle to the Hebrews, too (addressed not only to the Palestinian, but also secondarily to the Hebrew Christians everywhere), may be referred to, as Peter primarily (though not exclusively) addresses in both Epistles the Hebrew Christians of the dispersion (see on Pe1 1:1).

— Jamieson-Fausset-Brown Commentary (public domain)