Apostol § 65

Brethren, be even more diligent to make your calling and election sure ... for if you do these things you shall never fall; for so an entrance shall be supplied to you abundantly into the everlasting Kingdom of our Lord and Savior Jesus Christ. For this reason I will not be negligent to remind you always of these things, though you know them, and are established in the present truth. Yes, I think it is right, as long as I am in this body, to stir you up by reminding you, knowing that shortly I must put off my body, just as our Lord Jesus Christ showed me. Moreover I will be careful to ensure that you always have a reminder of these things after my decease. For we did not follow cunningly devised fables when we made known to you the power and coming of our Lord Jesus Christ, but were eyewitnesses of His majesty. For He received from God the Father honor and glory when such a voice came to Him from the excellent Glory: “This is My beloved Son, in whom I am well pleased.” And we heard this voice which came from heaven when we were with Him on the holy mountain. And so we have the prophetic word made more sure, which you do well to heed as a light that shines in a dark place, until the day dawns and the morning star rises in your hearts ...