
John 1:20 – He confessed, and did not deny, but confessed, “I am not the Christ.”
“John persisted in his calling and faithfully carried out the task to which God had appointed him; he bore witness to Christ the Lord and directed the people away from himself to Christ. The Jews should have paid heed to his testimony, taken it to heart, and realized that John was bearing witness to Christ and not to himself, especially since he declared unequivocally (John 1:20): “I am not the Christ [we shall return to these words later], but I have been sent to witness to Him. I am shouting and proclaiming that He is the Light and the Life of man, full of grace and truth.” John was commissioned to point to this Christ and to lead all mankind to Him, so that he might induce all who were dead in sin and sitting in darkness and the shadow of death (Luke 1:79) to come to Him, to believe in Him, to be animated and illumined by Him, and thus to become partakers of His grace and truth. For this was the purpose of Christ’s incarnation, death, and resurrection, that all believers in Him might be justified and saved.”
(Martin Luther, Sermons on the Gospel of St. John, AE 22:126)
John 1:21 – And they asked him, “What then? Are you Elijah?” He said, “I am not.” “Are you the Prophet?” And he answered, “No.”
“[The question arises:] In what sense does this same [John the] Baptist deny that he is a prophet (John 1:21), even though he was considered as and honored with the title “prophet,” not only by his father Zechariah (Luke 1:76) but also by all the people of Israel (Matthew 14:5; Mark 11:32)? We respond: Some people take the question of the messengers from Jerusalem as referring to the outstanding prophet promised in Deuteronomy 18:18. However, because they had already asked John if he was the Christ, the question of whether he was that great prophet would have been repeated uselessly. You see, it could be said only about the Messiah that He was that outstanding prophet who had promised through Moses, unless we wanted to say that those messengers and the Sanhedrin of Jerusalem had completely erred from the true meaning of this prophecy, something that anyone who notices their stupidity and blindness would easily believe. Some respond by saying that John denied that he was a prophet because Christ said he was greater and more excellent than the prophets. Some claim that when John denies that he is a prophet, he was regarding the fact that he is not one of the prophets of the Old Testament, about whom it was said in Matthew 11:13, “For all the prophets prophesied until John.” Some claim that the messengers asked and John replied about Elisha, who himself had ordered Naaman to be dipped in the waters. Some thing that John denied that he was a prophet because of his humility, even though he truly was a prophet. Some people suspect that John refused to accept the honor of prophet because he was not undertaking a duty of the political office, which the prophets in the Old Testament used.
But it is more simple to respond that John adjusted his response to the question of the messengers. They were asking him if he was a prophet, that is, if he was one of those ancient prophets, long dead already, who had been recalled to life through a Pythagorean transmigration of souls. You see, Elias Levita testifies in Thisbi that the Jewish leaders at that time had embraced the idea of the transmigration of souls, something we also conclude from the words of Herod (Matthew 14:1; Mark 6:14), where he makes this judgment about Christ: “John the Baptist has risen from the dead. That is why these powers are at work in Him.” However, the sense of the question is revealed especially from what comes before it. They are asking whether he is a prophet in the same sense as they ask whether he is Elijah. But they are asking if he is Elijah in this sense: Is he that Elijah, the Tishbite, who was carried into heaven by a fiery chariot and whose return in his own person they were awaiting, according to the misunderstood prophecy in Malachi 4:5? Therefore they are also asking him if he is a prophet in this sense: Is he one of the ancient prophets recalled to life by a divine miracle? This we conclude very clearly form the words of Luke 9:7–8, “Now Herod the tetrarch heard all that Christ was doing, and he was perplexed because it was said by some that John had been raised from the dead, by some that Elijah had appeared, and by the others that one of the ancient prophets had risen.” Therefore John had first denied that he was Elijah in that sense in which the messengers had asked if he was Elijah in his own person, even though the angel (Luke 1:17) and Christ Himself (Matthew 11:14) call him “Elijah” in a different sense: because he went ahead of that Messiah in the spirit and power of Elijah. In the same way, he denies that he is a prophet in that sense in which the messengers had asked him if he was a prophet, that is, one of the ancient prophets brought back to life, even though in a different sense he truly was a prophet: a herald of repentance and righteousness, the forerunner of the Messiah, a minister of the New Testament, etc.”
(Johann Gerhard, Theological Commonplaces XXVI/1, pgs. 30–31)
John 1:23 – He said, “I am the voice of one crying out in the wilderness, ‘Make straight the way of the Lord,’ as the prophet Isaiah said.” (Isaiah 40:3)
“This is an answer which no learned, wise, and holy man can endure, and John must literally be possessed of the devil and be a heretic. Only sinners and fools think him a holy, godly man; give way to his crying; and make room for the Lord, removing the obstacles from His way. The others, however, throw logs, stones, and dirt in His way; they even kill both the forerunner and the Lord Himself for daring to say such things to them. Why? John tells them to prepare the way of the Lord. That is to say, they do not have the Lord nor His way in them. What do they have then? Where the Lord is not, nor His way, there must be man’s own way, the devil, and all that is evil.”
(Martin Luther, Sermon for the Fourth Sunday of Advent, AE 75:178)
“Is it not a wrong and strange way of speaking when [John] says, “I am the voice of one crying”? How can a man be a voice? He ought to have said, “I am one crying with a voice”! But that is speaking according to the manner of the Scriptures. God told Moses: Aaron “shall be your mouth” (Exodus 4[:16]); that is, he will speak for you. Job says, “I was an eye to the blind and a foot to the lame” (John 29[:15]). Similarly, we say in German about a miser that gold is in his heart, and money in his life.
So here “I am the voice of one crying” means: “I am one who cries and have received my name from my work. Just as Aaron is called a mouth because of his eloquence, I am a voice because of my crying.” And that which in Hebrew reads “the voice of one crying” would be translated into Latin and German as a “a crying voice.” In the same way, Paul speaks of “the poor of the saints” instead of “the poor saints” (Romans 15[:26]), and of the “mystery of godliness” instead of “the godly mystery” (1 Timothy 3[:16]). Just as when I say “the language of the Germans,” I would say better “the German language.” So here “a voice of one crying” means “a crying voice.” The Hebrew tongue speaks this way much more.”
(Martin Luther, Sermon for the Fourth Sunday of Advent, AE 75:180–81)
“The ministry of the Word is that of God Himself, which he Himself wants to carry out through ordained means and instruments in His church… as John the Baptizer says in John 1:23, “I am the voice of one crying in the wilderness,” which Luther renders thus: Ich bin eine Stimme eines Rufers (I am a voice of a crier), in order to indicate that it is another who is crying through John.”
(Martin Chemnitz, Loci Theologici, Vol. 8, pg. 1314)
“In Exodus 4:14–16, it is recorded that when God the Lord wanted to send Moses to lead the children of Israel out of Egypt through him, that He assigned his brother Aaron for him…
In this account, Moses is a prototype of our Lord Christ; Aaron, however, is a prototype for John the Baptist. For just as Moses and Aaron were the two most prominent men in the Old Testament, so also Christ and John are the most prominent in the New Testament.
Just as Moses was sent to rescue the nation of Israel from Egypt and to give them the Law, so also Christ was sent by the Father “to give His life as an ransom for many” (Matthew 20:28); and to bring forth from the bosom of the Father the teaching of the Gospel (John 1:18)…
Like Aaron, who was born from the tribe of Levi, who went out with joy to meet his brother Moses and spoke to the people all that the Lord, through Moses, commanded him to say, as well as giving testimony that Moses truly had been sent by God as a physical savior; so also in the same manner John—who was also born from the tribe of Levi—went out with great joy to meet his cousin, Christ; and, as he heard the voice of the Bridegroom, he greatly rejoiced over it (John 3:29). By the command of God, he also spoke to the people and testified about Christ that He was the only Mediator and Savior, the true Light and the Little Lamb of God who bears the sins of the world (John 1:29).”
(Johann Gerhard, Sermon for the Fourth Sunday of Advent, in Postilla, Vol. 1, pgs. 36–37)
“The fact that John says here he is a voice of a preacher and baptizes with water, he thereby teaches us that he and other preachers of God the Lord make available their voices and their hands for preaching and for administration of the holy Sacraments. it is God the Lord, however, who is speaking through them, admonishing, and administering the holy Sacraments. “For God exhorts through us,” as St. Paul says in 2 Corinthians 5:20 and again in 2 Corinthians 13:3, “Christ is speaking through me.” … That’s why we should not look at the person of the preacher but rather at God’s working and power. “So, it is neither he who sows, nor he who waters some, but rather God the Lord who provides the growth and thriving success” (1 Corinthians 2:7).
(Johann Gerhard, Sermon for the Fourth Sunday of Advent, in Postilla, Vol. 1, pgs. 40–41)
“The sound of trumpets beautifully expresses the condition and office of the ministry. You see, they should “lift up their voices like trumpets and declare to the people their transgressions” (Isaiah 58:1). The trumpet gives off no sound by itself; rather, someone must blow into it. So also ministers speak by the Holy Spirit (Matthew 10:20). They are “the voices of one crying” (John 1:23). The trumpet presents a very clear tone, which people can hear from a distance. So also the sound of truth resounds a very long way.”
(Johann Gerhard, Theological Commonplaces XXVI/1, pg. 48)

