For we did not follow cleverly devised myths when we made known to you the power and coming of our Lord Jesus Christ, but we were eyewitnesses of his majesty. For when he received honor and glory from God the Father, and the voice was borne to him by the Majestic Glory, "This is my beloved Son, with whom I am well pleased," we ourselves heard this very voice borne from heaven, for we were with him on the holy mountain. And we have the prophetic word more fully confirmed, to which you will do well to pay attention as to a lamp shining in a dark place, until the day dawns and the morning star rises in your hearts, knowing this first of all, that no prophecy of Scripture comes from someone's own interpretation. For no prophecy was ever produced by the will of man, but men spoke from God as they were carried along by the Holy Spirit.
2 Peter 1:16-21
The utterance of the prophets who predicted Christ's advent in glory are to be taken as even surer evidence of the truth of it than the fact of the Transfiguration, because men of old spoke as they were moved by the Holy Spirit, and the vision on the Mount was not as clear a promise of His coming as the plain statements of Scripture are. The beauty of Peter's description of the Scriptures is some indication of the reverence and love he had for them (19). Let us not miss his meaning the Scriptures will shed forth light and radiance in the darkness of the world and in our hearts 'until the sunrise of glory'. The old Book will never lose its power to guide, and bless, and comfort and inspire and heal, until the ransomed of the Lord shall return and come to Zion with songs and everlasting joy upon their heads. We may safely trust its counsel, and will do well to take heed to its exhortations.
20 is difficult, but the meaning seems to be that what the prophets communicated was not of their own disclosure, that is, it was not revealed or originated by them. (The word translated 'interpretation' occurs only here in the New Testament, and literally means unloosing, unfolding, disclosing). This accords with the phrase in 21, 'not…. by the will of man'. The prophets were moved by the Holy Ghost, it was He Who spoke in them and through them. The picture given by the Greek word for 'moved' is that of a vessel borne along by the wind, and this accords well with Paul's statement in 2 Timothy 3:16 that all Scripture is 'God-breathed'. Just as God breathed into man the breath of life and man became a living soul, so God breathed into holy men of old and made their utterance the living word of God. If this be so, we may well pay heed to the Scriptures and rest upon their absolute authority. We dare not do otherwise.