2 Peter 1:12-15

12 Therefore, I will always be ready to remind you of these things, even though you already know them, and have been established in the truth which is present with you.  13 I consider it right, as long as I am in this earthly dwelling, to stir you up by way of reminder, 14 knowing that the laying aside of my earthly dwelling is imminent, as also our Lord Jesus Christ has made clear to me. 15 And I will also be diligent that at any time after my departure you will be able to call these things to mind.

Peter was always ready and willing to remind his people of their salvation and how they can be assured of it—and also, of any other Scriptural truth that he had been teaching them. And since God had made it clear to him that he would die soon, he also wanted them to remind themselves of what Christ has done for them, how they came to salvation, and how they were able to continue to grow strong in Christ.