For this is the one who was spoken of through the prophet Isaiah, saying: "A voice crying out in the desert: Prepare the way of the Lord. Make straight his paths."
Behold, I send my angel, and he will prepare the way before my face. And presently the Sovereign, whom you seek, and the angel of testimony, whom you desire, will arrive at his temple. Behold, he approaches, says the Lord of hosts.
And he will go before him with the spirit and power of Elijah, so that he may turn the hearts of the fathers to the sons, and the incredulous to the prudence of the just, so as to prepare for the Lord a completed people."