2 Peter 1:10-12

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; for in this way the entrance into the eternal kingdom of our Lord and Savior Jesus Christ will be abundantly supplied to you. 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.