Luke 3:17Meaning & Commentary from the Church Fathers

And having said that his own baptism was only with water, he next shews the excellence of that baptism which was brought by Christ, adding, He shall baptize you with the Holy Spirit, and fire, signifying by the very metaphor which he uses the abundance of grace. For he says not, “He shall give you the Holy Spirit,” but He shall baptize you. And again, by the addition of fire, he shews the power of grace. And as Christ calls the grace of the Spirit, water, (John 4:14; 7:38.) meaning by water the purity resulting from it, and the abundant consolation which is brought to minds which are capable of receiving Him; so also John, by the word fire, expresses the fervour and uprightness of grace, as well as the consuming of sins.

The phrase, "His shovel is in His hand," indicates that even though He baptizes you, it should not lead you to believe that you are beyond punishment. If you fail to maintain a life free from blame in the days to come, He will consume you with eternal fire. The tares represent those who possess a fruitless mindset and are solely focused on earthly matters.

By the following words, And he shall thoroughly purge his floor, the Baptist signifies that the Church belongs to Christ as her Lord.

Matthew says, Whose shoes I am not worthy to bear. If therefore it is worth while to understand any difference in these expressions, we can only suppose that John said one at one time, another at another, or both together, To bear his shoes, and to loose the latchet of his shoes, so that though one Evangelist may have related this, the others that, yet all have related the truth. But if John intended no more when he spoke of the shoes of our Lord but His excellence and his own humility, whether he said loosing the latchet of the shoes, or bearing them, they have still kept the same sense who by the mention of shoes have in their own words expressed the same signification of humility.

But because he says, He shall baptize you with the Holy Spirit, let no one admit that baptism to be valid in which the name of His Spirit only has been invoked, for we must ever keep undiminished that tradition which has been sealed to us in quickening grace. To add or take away ought thereof excludes from eternal life.

But it is well to know, that the treasures, which according to the promises are laid up for those who live honestly, are such as the words of man cannot express, as eye hath not seen, nor the ear heard, nor hath it entered into the heart of man to conceive. And the punishments which await sinners bear no proportion to any of those things which now affect the senses. And although some of those punishments are called by our names, yet their difference is very great. For when you hear of fire, you are taught to understand something else from the expression which follows, that is not quenched, beyond what comes into the idea of other fire.

Or: John saw into the secrets of the heart; but let us remember by whose grace, for it is of the gift of God to reveal things to man, not of the virtue of man, which is assisted by the Divine blessing, rather than capable of perceiving by any natural power of its own. But quickly answering them, he proved that he was not the Christ, for his works were by visible operations. For as man is compounded of two natures, i. e. soul and body, the visible mystery is made holy by the visible, the invisible by the invisible; for by water the body is washed, by the Spirit the soul is cleansed of its stains. It is permitted to us also in the very water to have the sanctifying influence of the Deity breathed upon us. And therefore there was one baptism of repentance, another of grace.

Matthew additionally recorded this event, which is also understood within the context of his third chapter.

But love is dangerous when it is uncontrolled. For he who loves any one ought to consider the nature and causes of loving, and not to love more than the object deserves. For if he pass the due measure and bounds of love, both he who loves, and he who is loved, will be in sin.

And hence John gloried not in the estimation in which all held him, nor in any way seemed to desire the deference of others, but embraced the lowest humility. Hence it follows, John answered.

But John denounces himself as unworthy to loose the latchet of Christ’s shoes: as if he openly said, I am not able to disclose the footsteps of my Redeemer, who do not presume unworthily to take unto myself the name of bridegroom, for it was an ancient custom thata when a man refused to take to wife her whom he ought, whoever should come to her betrothed by right of kin, was to loose his shoe. Or because shoes are made from the skins of dead animals, our Lord being made flesh appeared as it were with shoes, as taking upon Himself the carcase of our corruption. The latchet of the shoe is the connexion of the mystery. John therefore can not loose the latchet of the shoe, because neither is he able to fathom the mystery of the Incarnation, though he acknowledged it by the Spirit of prophecy.

But how could he answer them who in secret thought that he was Christ, except it was that they not only thought, but also (as another Evangelist declares) sending Priests and Levites to him asked him whether he was the Christ or not?

John proclaimed, “I baptize you with water for the purpose of repentance, but the one who follows me is my strength.” These words serve as a vivid reminder of the prophecy from Malachi regarding both John and Jesus: “Behold, I send my messenger (John) ahead of you to prepare your way. The Lord will suddenly come to His temple, and you long for His arrival...” John also stated, “He will have a winnowing fork in His hand to thoroughly clear His threshing floor. He will gather the wheat into His barn but will burn up the chaff with unquenchable fire.” Malachi addressed the theme of purification and the distinction among the elect: “For He is coming... Who can endure the day of His coming? Who can stand when He appears? For He will be like a refiner's fire and like fuller’s soap.

The landowner approached his threshing floor, where the grain had yet to be planted, and alongside the grain were numerous tares—those grainless fragments of the ear that had broken off during the threshing process. He used a shovel, casting the wheat into the air to distinguish the grain from the chaff; he gathered the former into the barn while the latter was cast into the fire.

While emphasizing the tangible results of repentance, John also highlighted that those who turn back to God would receive divine assistance in their moral efforts. He proclaimed that the aid of God's Spirit is essential for genuine inner transformation. "I baptize with water, but He who is mightier than I, with whom I am not worthy to untie the strap of my sandal, is coming; He will baptize you with the Holy Spirit and with fire." The unrepentant will experience the baptism of fire, while the contrite will be blessed with a heavenly endowment of a nobler will, greater strength, deeper understanding of God, and a more profound communion with Him.

Amidst the widespread anticipation of the imminent arrival of the Messiah, the crowds drawn to John recognized him as a divine messenger possessing qualities worthy of the Messiah. The ancient prophets had foretold the coming of the promised Christ, linking His arrival to the cleansing of sin and impurity, as noted in Ezekiel 36:25, 37:23, and Zechariah 13:1. Such prophecies carried considerable weight, prompting many to speculate whether John himself was the Christ. However, recognizing the risk that such beliefs could hinder the faithful from embarking on the salvific journey that the Forerunner was preparing in people's hearts, John unequivocally declared that he was not the Christ but merely a herald of Him. He emphasized that his baptism served a preparatory purpose.