2 Peter 1:10-12

10Therefore, brothers and sisters, make every effort to be sure of your calling and election. For by doing this you will never stumble into sin.

11For thus an entrance into the eternal kingdom of our Lord and Savior, Jesus Christ, will be richly provided for you.

12Therefore, I intend to remind you constantly of these things even though you know them and are well established in the truth that you now have.