2 Peter 1:10; 2 Peter 3:15

2 Peter 1:10

10 Therefore, brethren, be all the more diligent to make certain about His calling and choosing you; for as long as you practice these things, you will never stumble;

2 Peter 3:15

15 and regard the patience of our Lord as salvation; just as also our beloved brother Paul, according to the wisdom given him, wrote to you,