Today's gospel reading is taken from Luke 3:1-6. It tells of St. John the Baptist proclaiming a baptism of repentance in preparation for the coming of the Messiah. John is the "voice in the wilderness" foretold by Isaiah, the herald who urges us to prepare our hearts for the Savior during this Advent season, as we wait for the Lord's coming.
In his Commentary on St. Luke's Gospel, Origen writes:
We read in the prophet Isaiah: “A voice cries out in the desert: Prepare a way for the Lord. Build him a straight highway.” A way by land? Could the Word of God travel such a road? Is it not rather a way within ourselves that we have to prepare for the Lord? Is it not a straight and level highway in our hearts that we are to make ready? Surely this is the way by which the Word of God enters, a way that exists in the spaciousness of the human body. The human heart is vast, broad, and capacious, if only it is pure.
[I]f what contains so much is not small, let a way be prepared in it for the Lord, a straight highway along which the Word and Wisdom of God may advance. Prepare a way for the Lord by living a good life and guard that way by good works. Let the Word of God move in you unhindered and give you a knowledge of his coming and of his mysteries. To him be glory and power for ever and ever. Amen.