Joseph Benson's Commentary of the Old and New Testaments - 2 Peter 3:8
2 Peter 3:8. Be not ye ignorant Whatever they are; of this one thing Which casts much light on the point in hand; that one day is with the Lord as a thousand years, and a thousand years as one day This is an allusion to Psalms 90:4, where Moses had said, A thousand years in thy sight are as one day, which words St. Peter applies with regard to the period intervening between the time when he wrote, and the last day; denoting thereby, 1st, God’s eternity, whereby he exceeds all measure... read more
Albert Barnes' Notes on the Whole Bible - 2 Peter 3:8
But, beloved, be not ignorant of this one thing, that one day is with the Lord as a thousand years - This 2 Peter 3:8-9 is the second consideration by which the apostle meets the objection of scoffers against the doctrine of the second coming of the Saviour. The objection was, that much time, and perhaps the time which had been supposed to be set for his coming, had passed away, and still all things remained as they were. The reply of the apostle is, that no argument could be drawn from this,... read more