2 This then did John say concerning Christ. And what said Christ of John? We have just now heard. “He began to say to the multitudes concerning John, What went ye out into the wilderness to see? A reed shaken with the wind?” Surely not; for John was not “blown about by every wind of doctrine.” “But what went ye out for to see? A man clothed in soft raiment?” No, for John was clothed in rough apparel; he had his raiment of camel's hair, not of down. “But what went ye out for to see?
A Prophet? Yea, and more than a Prophet.” Why “more than a Prophet”? The Prophets foretold that the Lord would come, whom they desired to see, and saw not; but to him was vouchsafed what they sought. John saw the Lord; he saw Him, pointed his finger toward Him, and said, “Behold the Lamb of God, who takes away the sins of the world;” behold, here He is. Now had He come and was not acknowledged; and so a mistake was made also as to John himself. Behold then here is He whom the Patriarchs desired to see, whom the Prophets foretold, whom the Law prefigured.
“Behold the Lamb of God, who takes away the sins of the world.” And he gave a goodly testimony to the Lord, and the Lord to him. “Among them that are born of women,” says the Lord, “there has not risen a greater than John the Baptist: notwithstanding, he that is less in the kingdom of heaven is greater than he;” less in time, but greater in majesty. This He said, meaning Himself to be understood. Now exceedingly great among men is John the Baptist, than whom among men Christ alone is greater.
It may also be thus stated and explained, “Among them that are born of women there has not risen a greater than John the Baptist: notwithstanding, he that is the least in the kingdom of heaven is greater than he.” Not in the sense that I have before explained it. “Notwithstanding, he that is the least in the kingdom of heaven is greater than he;” the kingdom of heaven he meant where the Angels are; he then that is the least among the Angels, is greater than John. Thus He set forth to us the excellence of that kingdom which we should long for; set before us a city, of which we should desire to be citizens.
What sort of citizens are there? How great are they! Whoso is the least there, is greater than John. Than what John? “Than whom there has not risen a greater among them that are born of women.”
Source: Sermons on Selected Lessons of the New Testament (New Advent)