Verse 19. And we - St. Peter here speaks in the name of all Christians. Have the word of prophecy - The words of Moses, Isaiah, and all the prophets, are one and the same word, every way consistent with itself. St. Peter does not cite any particular passage, but speaks of their entire testimony. More confirmed - By that display of his glorious majesty. To which word ye do well that ye take heed, as to a lamp which shone in a dark place - Wherein there was neither light nor window. Such anciently was the whole world, except that little spot where this lamp shone. Till the day should dawn - Till the full light of the gospel should break through the darkness. As is the difference between the light of a lamp and that of the day, such is that between the light of the Old Testament and of the New. And the morning star - Jesus Christ, Rev. xxii, 16. Arise in your hearts - Be revealed in you.
Verse 20. Ye do well, as knowing this, that no scripture prophecy is of private interpretation - It is not any man's own word. It is God, not the prophet himself, who thereby interprets things till then unknown.
Verse 21. For prophecy came not of old by the will of man - Of any mere man whatever. But the holy men of God - Devoted to him, and set apart by him for that purpose, spake and wrote. Being moved - Literally, carried. They were purely passive therein.