"I am the Voice, etc." comes from
Isaiah 40:3. Witham expands the meaning as: "I am a servant, and prepare paths, your hearts, for the Lord. I come, he says, to say that He is at the doors who is expected, that you may be prepared to go whithersoever He may bid you.” MacEvilly notes that, "Having already declared what he was not, he now declares in very distinct terms, what he was, thus meaning to show the nothingness of his origin, compared with the
Messiah." ==Commentary from the Church Fathers==