17. And he shall go before him in the spirit and power of Elias; that he may turn the hearts of the fathers unto the children, and the incredulous to the wisdom of the just, to prepare unto the Lord a perfect people.
18. And Zachary said to the angel: Whereby shall I know this? for I am an old man, and my wife is advanced in years.
19. And the angel answering, said to him: I am Gabriel, who stand before God: and am sent to speak to thee, and to bring thee these good tidings.