2 Peter 1:10-12

Therefore, believers, be all the more diligent to make certain about His calling and choosing you [be sure that your behavior reflects and confirms your relationship with God]; for by doing these things [actively developing these virtues], you will never stumble [in your spiritual growth and will live a life that leads others away from sin]; for in this way entry into the eternal kingdom of our Lord and Savior Jesus Christ will be abundantly provided to you. Therefore, I will always be ready to remind you of these things, even though you already know them and are established in the truth which is held firmly in your grasp.