The voice of him that cries in the wilderness, Prepare you the way of the LORD, make straight in the desert a highway for our God.
All Commentaries on Isaiah 40:3 Go To Isaiah 40
Augustine of Hippo
AD 430
John [the Baptist] was filled with the Holy Spirit; and he had a baptism from heaven, not from human beings. But how long did he have it? He said, “Prepare the way for the Lord.” But when the Lord was known, he himself became the way; there was no longer need for the baptism of John, by which the way was to be prepared for the Lord.