12: Wherefore I will not be negligent to put you always in remembrance of these things, though ye know them, and be established in the present truth. 13: Yea, I think it meet, as long as I am in this tabernacle, to stir you up by putting you in remembrance; 14: Knowing that shortly I must put off this my tabernacle, even as our Lord Jesus Christ hath shewed me. 15: Moreover I will endeavour that ye may be able after my decease to have these things always in remembrance. 16: For we have not followed cunningly devised fables, when we made known unto you the power and coming of our Lord Jesus Christ, but were eyewitnesses of his majesty. 17: For he received from God the Father honour and glory, when there came such a voice to him from the excellent glory, This is my beloved Son, in whom I am well pleased. 18: And this voice which came from heaven we heard, when we were with him in the holy mount. 19: We have also a more sure word of prophecy; whereunto ye do well that ye take heed, as unto a light that shineth in a dark place, until the day dawn, and the day star arise in your hearts: 20: Knowing this first, that no prophecy of the scripture is of any private interpretation. 21: For the prophecy came not in old time by the will of man: but holy men of God spake as they were moved by the Holy Ghost.
Peter feels a sense of obligation to constantly remind the believers even though they may know them. Peter is aware of his decease at sometime and so he fulfils his charge from Christ. He says our faith is not a clever story of fiction. But it is a testimony of his eyewitness of his life and sayings. He tells of the voice from heaven which he heard on the mount of transfiguration. However then he goes on to talk of a much more sure word of testimony which was the prophetic word. Our memories even our memories of our own life are not as sure a testimony was the word of prophecy. He says that prophecy is not a matter of personal opinion or interpretation because the prophesies do not come as a result of the prophets enthusiasm but these holy men of God are moved by the Holy Spirit. The word is ‘moved’ like the sail of a ferry which is carried along by the wind of the Spirit.