Matthew Henry Commentary 2 Peter 3:1-4

"This is now, beloved, the second epistle that I write unto you; and in both of them I stir up your sincere mind by putting you in remembrance; that ye should remember the words which were spoken before by the holy prophets, and the commandments of the Lord and Saviour through your apostles: knowing this first, that in the last days mockers shall come with mockery, walking after their own lusts, and saying, Where is the promise of his coming? for, from the day that the fathers fell asleep, all things continue as they were from the beginning of the creation." — 2 Peter 3:1-4 (ASV)

The purified minds of Christians should be stirred up, so that they may be active and lively in the work of holiness. There will be scoffers in the last days, under the gospel, men who make light of sin and mock at salvation by Jesus Christ.

One very important article of our faith concerns something that rests solely on a promise, and scoffers will attack it until our Lord comes. They will not believe that He will come. Because they see no changes, they do not fear God (Psalms 55:19). What He has never done, they imagine He never can do, or never will do.