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Translation
King James Version
Whose fan is in his hand, and he will throughly purge his floor, and will gather the wheat into his garner; but the chaff he will burn with fire unquenchable.
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KJV (with Strong's)
Whose G3739 fan G4425 is in G1722 his G846 hand G5495, and G2532 he will throughly purge G1245 his G846 floor G257, and G2532 will gather G4863 the wheat G4621 into G1519 his G846 garner G596; but G1161 the chaff G892 he will burn G2618 with fire G4442 unquenchable G762.
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Complete Jewish Bible
He has with him his winnowing fork to clear out his threshing floor and gather his wheat into his barn, but he will burn up the straw with unquenchable fire!"
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Berean Standard Bible
His winnowing fork is in His hand to clear His threshing floor and to gather the wheat into His barn; but He will burn up the chaff with unquenchable fire.”
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American Standard Version
whose fan is in his hand, thoroughly to cleanse his threshing-floor, and to gather the wheat into his garner; but the chaff he will burn up with unquenchable fire.
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World English Bible Messianic
whose fan is in his hand, and he will thoroughly cleanse his threshing floor, and will gather the wheat into his barn; but he will burn up the chaff with unquenchable fire.”
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Geneva Bible (1599)
Whose fanne is in his hande, and hee will make cleane his floore, and will gather the wheate into his garner, but the chaffe will hee burne vp with fire that neuer shalbe quenched.
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Young's Literal Translation
whose winnowing shovel is in his hand, and he will thoroughly cleanse his floor, and will gather the wheat to his storehouse, and the chaff he will burn with fire unquenchable.'
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In the KJVVerse 25,043 of 31,102

Study This Verse

SUMMARY

Luke 3:17 is a profound declaration by John the Baptist, vividly portraying the coming Messiah's role as a divine judge. Employing familiar agricultural imagery, John prophesies that the Messiah will decisively separate humanity, gathering those who are truly His into eternal safety while consigning the unrepentant to irreversible judgment. This verse underscores the Messiah's supreme authority and the ultimate, eternal consequences of one's response to God's redemptive plan.

CONTEXT

  • Literary Context: This verse concludes a powerful segment of John the Baptist's preaching, immediately following his declaration in Luke 3:16 that the one coming after him would baptize with the Holy Spirit and with fire. The imagery of fire in Luke 3:16 foreshadows the judgment described in Luke 3:17. John's entire ministry, as depicted in Luke 3:1-20, serves to prepare the way for the Messiah, calling people to repentance and warning them of the impending divine visitation. The crowds, already curious about John's identity and perhaps wondering if he was the Christ (as noted in Luke 3:15), are given a clear picture of the Messiah's ultimate authority and purpose.
  • Historical & Cultural Context: The agricultural metaphors in Luke 3:17 would have been instantly recognizable to John's audience in ancient Israel. After harvesting, grain was threshed to separate the edible kernels from the stalks. This mixture was then taken to a "threshing floor" (Greek: halon), typically a flat, hard-packed circular area exposed to the wind. A farmer would use a "fan" (Greek: ptyon), which was a winnowing fork or shovel, to toss the threshed grain and chaff into the air. The heavier grain ("wheat") would fall back to the floor, while the lighter "chaff" (worthless husks, straw, and debris) would be carried away by the breeze. The collected wheat was then stored in a "garner" (a barn or granary), while the discarded chaff was often gathered and burned, both to dispose of it and sometimes to use the ashes as fertilizer. This process was a common, essential part of life, making it a powerful and accessible analogy for divine judgment and separation.
  • Key Themes: Luke 3:17 contributes significantly to several major themes within Luke's Gospel and the broader biblical narrative. Firstly, it highlights the theme of Divine Judgment and Separation, asserting the Messiah's absolute authority to discern and divide humanity based on their spiritual condition. This separation is not arbitrary but a consequence of one's response to God's call for repentance, as emphasized in John's earlier warnings in Luke 3:7-9. Secondly, the verse underscores the Messiah's Authority and Sovereignty, depicting Him as the one who holds the "fan" and executes this decisive judgment. This portrayal aligns with the broader New Testament presentation of Jesus as the appointed judge of all humanity, as seen in John 5:22. Finally, it introduces the theme of Eschatological Consequences, presenting two distinct and eternal destinies: the gathering of the wheat into the garner, symbolizing salvation and eternal life, and the burning of the chaff with unquenchable fire, representing eternal punishment. This stark contrast echoes warnings found throughout the prophetic books and is further developed in Jesus' own teachings about the kingdom of God and final judgment, such as the Parable of the Wheat and Tares.

EXPOSITION AND ANALYSIS

Key Word Analysis

  • fan (Greek, ptýon', G4425): This term refers to a winnowing fork or shovel, a tool used in ancient agriculture to toss threshed grain into the air. Its presence in the Messiah's hand signifies His readiness and authority to execute a decisive separation and purification. It is not merely a passive instrument but an active tool of judgment.
  • throughly purge (Greek, diakatharízō', G1245): Derived from a word meaning "to cleanse perfectly" or "to clear away completely," this verb emphasizes the comprehensive and decisive nature of the Messiah's action. It implies an exhaustive process of purification, where all impurities and worthless elements are removed, leaving only what is pure and valuable. This is a thorough, not partial, cleansing.
  • unquenchable (Greek, ásbestos', G762): This adjective literally means "not extinguished" or "not to be put out." Applied to fire, it stresses the eternal, inescapable, and irreversible nature of the judgment for the unrighteous. It conveys the idea of a fire that cannot be put out by human effort, signifying a perpetual and unending consequence.

Verse Breakdown

  • "Whose fan [is] in his hand": This clause immediately identifies the Messiah as the one possessing the ultimate authority and means for judgment and separation. The "fan" (winnowing fork) is not just a tool, but a symbol of His sovereign power and readiness to act. It implies that He is fully prepared and equipped to carry out His divine task.
  • "and he will throughly purge his floor": This describes the Messiah's decisive action of purification and separation. "His floor" refers to the world, or more specifically, humanity, which He will cleanse completely. The verb "throughly purge" emphasizes the thoroughness and finality of this cleansing process, leaving no impurity or worthless element behind.
  • "and will gather the wheat into his garner": This part of the verse depicts the positive outcome for those who are righteous. The "wheat" symbolizes those who have genuinely repented and borne fruit worthy of that repentance. They will be "gathered" by the Messiah into "his garner" (a barn or storehouse), which represents a place of safety, security, and eternal blessing, often understood as God's kingdom or eternal dwelling.
  • "but the chaff he will burn with fire unquenchable": This stark contrast presents the dire fate of the unrighteous. The "chaff" symbolizes those who are spiritually worthless, lacking genuine faith and fruit. They will be "burned" by the Messiah, and the "fire unquenchable" signifies an eternal, inescapable, and irreversible judgment. This imagery conveys the severity and finality of divine wrath against unrepentant sin.

Literary Devices

Luke 3:17 is rich with Metaphor and Symbolism, drawing heavily on familiar agricultural practices to convey profound theological truths. The entire scene of the threshing floor, the winnowing fork, the wheat, the chaff, the garner, and the unquenchable fire functions as an extended metaphor for divine judgment and separation. Each element holds symbolic weight: the "fan" symbolizes the Messiah's authority and means of judgment; the "floor" represents the realm where this judgment takes place (the world or humanity); the "wheat" symbolizes the righteous, those who have responded to God's call with genuine faith and repentance; the "chaff" symbolizes the unrighteous, those who are spiritually barren and worthless in God's sight; the "garner" symbolizes the eternal dwelling of the righteous (heaven or God's kingdom); and the "fire unquenchable" symbolizes eternal punishment or hell. The verse also employs Juxtaposition and Contrast, sharply setting the destiny of the wheat (gathering into the garner) against the destiny of the chaff (burning with unquenchable fire), thereby highlighting the ultimate and irreversible bifurcation of humanity based on their relationship with the Messiah. This stark contrast serves to underscore the urgency of repentance and the seriousness of one's spiritual condition.

THEOLOGICAL AND THEMATIC CONNECTIONS

Luke 3:17 stands as a powerful testament to the biblical doctrine of divine judgment and the ultimate separation of humanity. It reinforces the consistent biblical teaching that God is just and will ultimately bring all things to account, distinguishing between those who are truly His and those who are not. This judgment is not a random act but the necessary culmination of God's redemptive plan, ensuring that righteousness prevails and sin is dealt with decisively. The verse highlights the eschatological reality of two distinct destinies, emphasizing the eternal consequences of one's earthly choices and response to the gospel. It serves as a stark reminder of God's holiness and His unwavering commitment to justice, while simultaneously offering profound comfort to those who are found to be "wheat" in His sight.

REFLECTION AND APPLICATION

Luke 3:17 serves as both a solemn warning and a profound source of comfort, urging every individual to seriously consider their standing before God. For those who have heard John's call to repentance and have genuinely turned to Christ, it offers the blessed assurance of salvation and eternal security within God's "garner." It reminds us that our faith is not merely intellectual assent but must be accompanied by "fruit worthy of repentance," as John exhorted in Luke 3:8. Conversely, for those who remain unrepentant or who profess faith without genuine transformation, this verse is a stark reminder of the inevitable and severe consequences of rejecting God's grace. It compels us to examine our lives, asking whether we are truly "wheat"—living in genuine faith, obedience, and producing spiritual fruit—or merely "chaff," outwardly religious but inwardly devoid of true spiritual life. This passage underscores the urgency of choosing Christ and living a life transformed by His grace, knowing that a day of ultimate reckoning is coming when all will be separated by the divine Judge.

Questions for Reflection

  • Am I producing "fruit worthy of repentance" in my life, or am I living in a way that resembles "chaff"?
  • How does the imagery of the "unquenchable fire" influence my understanding of God's justice and the urgency of the Gospel?
  • In what areas of my life do I need to allow the Messiah to "throughly purge" me, removing impurities and sin?

FAQ

Who is the "Whose" in this verse, and why is His "fan" in His hand?

Answer: The "Whose" refers to the Messiah, Jesus Christ. John the Baptist is prophesying about the one who is coming after him, who is mightier than he (as stated in Luke 3:16). The "fan" (a winnowing fork) in His hand symbolizes His absolute authority and readiness to execute divine judgment and separation. It signifies that He is the sovereign agent appointed by God to distinguish between the righteous and the unrighteous, preparing to cleanse His "floor" (the world or humanity).

What does "unquenchable fire" signify in this context?

Answer: "Unquenchable fire" signifies a judgment that is eternal, inescapable, and irreversible. It is a metaphor for the final and perpetual punishment for those who reject God and His Messiah. This is not a temporary or purifying fire, but one that cannot be extinguished by human effort, pointing to the everlasting nature of the consequences for the unrepentant, as also described in other New Testament passages like Mark 9:43 and Revelation 20:15.

Is this verse primarily about salvation or judgment?

Answer: This verse is about both salvation and judgment, specifically focusing on the ultimate separation that the Messiah will bring. It describes the gathering of the "wheat" (the righteous) into His "garner" (salvation and eternal life) and the burning of the "chaff" (the unrighteous) with "unquenchable fire" (judgment and eternal condemnation). Thus, it presents two distinct and eternal outcomes, underscoring the critical importance of one's response to the Messiah.

CHRIST-CENTERED FULFILLMENT

Luke 3:17 finds its profound Christ-centered fulfillment in Jesus of Nazareth, the promised Messiah. John the Baptist's prophecy is not merely a general statement about judgment, but a specific foretelling of the work of the one who would indeed come after him. Jesus Himself affirmed this role, declaring in John 5:22 that the Father "has committed all judgment unto the Son." While His first coming was primarily to offer salvation, His ministry undeniably began the process of separation, as people either accepted or rejected Him, thus revealing their true spiritual state. The "fan" in His hand speaks to His inherent authority, not only as the one who offers grace but also as the one who will ultimately bring all things to account. He is the one who, through His life, death, and resurrection, provides the means for humanity to become "wheat" through faith in Him, being cleansed by His blood and indwelt by His Spirit. The ultimate fulfillment of this verse awaits His second coming, when He will definitively "purge his floor," gathering His elect into His eternal "garner" (see Matthew 24:31), and consigning those who have rejected Him to the "fire unquenchable," as vividly portrayed in the Parable of the Sheep and Goats. Thus, Luke 3:17 powerfully points to Jesus as the sovereign Lord, the Savior who offers life, and the righteous Judge who will ensure perfect justice.

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Commentary on Luke 3 verses 15–20

I. II. Main points1. 2. Sub-points(1.) (2.) Details

We are now drawing near to the appearance of our Lord Jesus publicly; the Sun will not be long after the morning-star. We are here told,

I. How the people took occasion, from the ministry and baptism of John, to think of the Messiah, and to think of him as at the door, as now come. Thus the way of the Lord was prepared, and people were prepared to bid Christ welcome; for, when men's expectations are raised, that which they are in expectation of becomes doubly acceptable. Now when they observed what an excellent doctrine John Baptist preached, what a divine power went along with it, and what a tendency it had to reform the world, 1. They began presently to consider that now was the time for the Messiah to appear. The sceptre was departed from Judah, for they had no king but Caesar; nay, and the law-giver too was gone from between his feet, for Herod had lately slain the sanhedrim. Daniel's seventy weeks were now expiring; and therefore it was but three or four years after this that they looked that the kingdom of heaven should appear immediately, Luk 19:11. Never did the corrupt state of the Jews more need a reformation, nor their distressed state more need a deliverance, than now. 2. Their next thought was, "Is not his he that should come?" All thinking men mused, or reasoned, in their hearts, concerning John, whether he were the Christ or not. He had indeed none of the external pomp and grandeur in which they generally expected the Messiah to appear; but his life was holy and strict, his preaching powerful and with authority, and therefore "why may we not think that he is the Messiah, and that he will shortly throw off this disguise, and appear in more glory?" Note, That which puts people upon considering, reasoning with themselves, prepares the way for Christ.

II. How John disowned all pretensions to the honour of being himself the Messiah, but confirmed them in their expectations of him that really was the Messiah, Luk 3:16, Luk 3:17. John's office, as a crier or herald, was to give notice that the kingdom of God and the King of that kingdom were at hand; and therefore, when he had told all manner of people severally what they must do ("You must do this, and you must do that"), he tells them one thing more which they must all do: they must expect the Messiah now shortly to appear. And this serves as an answer to their musings and debates concerning himself. Though he knew not their thoughts, yet, in declaring this, he answered them.

1.He declares that the utmost he could do was to baptize them with water. He had no access to the Spirit, nor could command that or work upon that; he could only exhort them to repent, and assure them of forgiveness, upon repentance; he could not work repentance in them, nor confer remission on them.

2.He consigns them, and turns them over, as it were, to Jesus Christ, for whom he was sent to prepare the way, and to whom he was ready to transfer all the interest he had in the affections of the people, and would have them no longer to debate whether John was the Messiah or no, but to look for him that was really so.

(1.)John owns the Messiah to have a greater excellency than he had, and that he was in all things preferable to him; he is one the latchet of whose shoe he does not think himself worthy to loose; he does not think himself worthy to be the meanest of his servants, to help him on and off with his shoes. John was a prophet, yea more than a prophet, more so than any of the Old Testament prophets; but Christ was a prophet more than John, for it was both by the Spirit of Christ, and of the grace of Christ, that all the prophets prophesied, and John among the rest, Pe1 1:10, Pe1 1:11. This was a great truth which John came to preach; but the manner of his expressing it bespeaks his humility, and in it he not only does justice to the Lord Jesus, but does him honour too: "He is one whom I am not worthy to approach, or draw nigh to, no not as a servant." Thus highly does it become us to speak of Christ, and thus humbly of ourselves.

(2.)He owns him to have a greater energy than he had: "He is mightier than I, and does that which I cannot do, both for the comfort of the faithful and for the terror of hypocrites and dissemblers." They thought that a wonderful power went along with John; but what was that compared with the power which Jesus would come clothed with? [1.] John can do no more than baptize with water, in token of this, that they ought to purify and cleanse themselves; but Christ can, and will, baptize with the Holy Ghost; he can give the Spirit to cleanse and purify the heart, not only as water washes off the dirt on the outside, but as fire purges out the dross that is within, and melts down the metal, that it may be cast into a new mould. [2.] John can only preach a distinguishing doctrine, and by word and sign separate between the precious and the vile; but Christ hath his fan in his hand, with which he can, and will, perfectly separate between the wheat and the chaff. He will thoroughly purge his floor; it is his own, and therefore he will purge it, and will cast out of his church the unbelieving impenitent Jews, and confirm in his church all that faithfully follow him. [3.] John can only speak comfort to those that receive the gospel, and, like other prophets, say to the righteous that it shall be well with them; but Jesus Christ will give them comfort. John can only promise them that they shall be safe; but Christ will make them so: he will gather the wheat into his garner; good, serious, solid people he will gather now into his church on earth, which shall be made up of such, and he will shortly gather them into his church in heaven, where they shall be for ever sheltered. [4.] John can only threaten hypocrites, and tell the barren trees that they shall be hewn down and cast into the fire; but Christ can execute that threatening; those that are as chaff, light, and vain, and worthless, he will burn with fire unquenchable. John refers here to Mal 3:18; Mal 4:1, Mal 4:2. Then, when the floor is purged, ye shall return, and discern between the righteous and the wicked, for the day comes that shall burn as an oven.

The evangelist concludes his account of John's preaching with an et caetera (Luk 3:18): Many other things in his exhortation preached he unto the people, which are not recorded. First, John was an affectionate preacher. He was parakalōn - exhorting, beseeching; he pressed things home upon his hearers, followed his doctrine close, as one in earnest. Secondly, He was a practical preacher. Much of his preaching was exhortation, quickening them to their duty, directing them in it, and not amusing them with matters of nice speculation. Thirdly, He was a popular preacher. Though he had scribes and Pharisees, men of polite learning, attending his ministry, and Sadducees, men of free thought, as they pretended, yet he addressed himself to the people, pros ton laon - to the laity, and accommodated himself to their capacity, as promising himself best success among them. Fourthly, He was an evangelical preacher, for so the word here used signifies, euēngelizeto - he preached the gospel to the people; in all his exhortations, he directed people to Christ, and excited and encouraged their expectations of him. When we press duty upon people, we must direct them to Christ, both for righteousness and strength. Fifthly, He was a copious preacher: Many other things he preached, polla men kai hetera - many things, and different. He preached a great deal, shunned not to declare the whole counsel of God; and he varied in his preaching, that those who were not reached, and touched, and wrought upon, by one truth, might be by another.

III. How full a stop was put to John's preaching. When he was in the midst of his usefulness, going on thus successfully, he was imprisoned by the malice of Herod (Luk 3:19, Luk 3:20): Herod the tetrarch being reproved by him, not only for living in incest with his brother Philip's wife, but for the many other evils which Herod had done (for those that are wicked in one instance are commonly so in many others), he could not bear it, but contracted an antipathy to him for his plain dealing, and added this wickedness to all the rest, which was indeed above all, that he shut up John in prison, put that burning and shining light under a bushel. Because he could not bear his reproofs, others should be deprived of the benefit of his instructions and counsels. Some little good he might do to those who had access to him, when he was in prison; but nothing to what he might have done if he had had liberty to go about all the country, as he had done. We cannot think of Herod's doing this without the greatest compassion and lamentation, nor of God's permitting it without admiring the depth of the divine counsels, which we cannot account for. Must he be silenced who is the voice of one crying in the wilderness? Must such a preacher be shut up in prison who ought to have been set up in the courts of the temple? But thus the faith of his disciples must be tried; thus the unbelief of those who rejected him must be punished; thus he must be Christ's forerunner in suffering as well as preaching; and thus, having been for about a year and a half preparing people for Christ, he must now give way to him, and, the Sun being risen, the morning-star must of course disappear.

Matthew Henry (1662–1714) — Commentary on the Whole Bible. This section covers verses 15–20. Public domain.
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IrenaeusAD 202
Against Heresies Book I
They also maintain that John indicated the same thing when he said, "The fan is in His hand, and He will thoroughly purge the floor, and will gather the wheat into His garner; but the chaff He will burn with fire unquenchable.".
and slaying the impious with the breath of His lips, and having a fan in His hands, and cleansing His floor, and gathering the wheat indeed into His barn, but burning the chaff with unquenchable fire.
Clement of AlexandriaAD 215
The Instructor Book 1
"For the fan is in the Lord's hand, by which the chaff due to the fire is separated from the wheat."
Origen of Alexandria (as quoted by Aquinas, AD 1274)AD 253
Catena Aurea by Aquinas
Or, because without the wind the wheat and chaff cannot be separated, therefore He has the fan in His hand, which shows some to be chaff, some wheat; for when you were as the light chaff; (i. e. unbelieving,) temptation showed you to be what you knew not; but when you shall bravely endure temptation, the temptation will not make you faithful and enduring, but it will bring to light the virtue which was hid in you.
Basil of Caesarea (as quoted by Aquinas, AD 1274)AD 379
Catena Aurea by Aquinas
(lib. de Spir. Sanct. c. 12.) 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.

(non occ.) But they are mixed up with those who are worthy of the kingdom of heaven, as the chaff with the wheat. This is not however from consideration of their love of God and their neighbour, nor from their spiritual gifts or temporal blessings.
Gregory of Nyssa (as quoted by Aquinas, AD 1274)AD 395
Catena Aurea by Aquinas
(non occ.) 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.
Ambrose of Milan (as quoted by Aquinas, AD 1274)AD 397
Catena Aurea by Aquinas
Now what could be more absurd than that he who was fancied to be in another should not be believed in his own person? He whom they thought to have come by a woman, is not believed to have come by a virgin; while in fact the sign of the Divine coming was placed in the childbearing of a virgin, not of a woman.

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. The latter was by both water and Spirit, the former by one only; the work of man is to bring forth repentance for his sin, it is the gift of God to pour in the grace of His mystery. Devoid therefore of all envy of Christ's greatness, he declared not by word but by work that he was not the Christ. Hence it follows, There cometh after me one mightier than I. In those words, mightier than I, he makes no comparison, for there can be none between the Son of God and man, but because there are many mighty, no one is mightier but Christ. So far indeed was he from making comparison, that he adds, Whose shoes latchet I am not worthy to unloose.

By the words, Whose shoes I am not worthy to bear, he shows that the grace of preaching the Gospel was conferred upon the Apostles, who were shod for the Gospel. (Eph. 6:15.) He seems however to say it, because John frequently represented the Jewish people.

By the sign of a fan then the Lord is declared to possess the power of discerning merits, since when the corn is winnowed in the threshing floor, the full cars are separated from the empty by the trial of the wind blowing them. Hence it follows, And he shall gather the wheat into his barn. By this comparison, the Lord shows that on the day of judgment He will discern the solid merits and fruits of virtue from the unfruitful lightness of empty boasting and vain deeds, about to place the men of more perfect righteousness in His heavenly mansion. For that is indeed the more perfect fruit which was thought worthy to be like to Him who fell as a grain of wheat, that He might bring forth fruit in abundance. (John 12:24.)
Ambrose of MilanAD 397
EXPOSITION OF THE GOSPEL OF LUKE 2.82
Through the sign of the fan, the Lord is said to have the right to distinguish merits. When the grain is winnowed on the threshing floor, the full grain is separated from the empty, the fruitful is separated from the worthless, as if by a weighing of a blowing breeze. So through this comparison, the Lord is manifest, because on the day of judgment, he separates the merits and fruits of solid virtue from the unfruitful shallowness of worthless ostentation and inadequate deeds, before he establishes the people of perfect merit in a heavenly home. For he who has deserved to be like him is the perfect fruit. The Lord is like the grain of wheat that has died. So he confers very many fruits on us, hated by chaff and no friend to worthless merits. And therefore, a fire that is not harmful by its nature will burn before him. For he who burns up the evils of wickedness adds to the radiance of goodness.
John Chrysostom (as quoted by Aquinas, AD 1274)AD 407
Catena Aurea by Aquinas
(Hom. in Matt. 11.) But John's desire when he spoke to the Publicans and soldiers, was to bring them over to a higher wisdom, for which as they were not fitted, he reveals to them commoner truths, lest if he put forward the higher they should pay no attention thereto, and be deprived of the others also.

(ubi sup.) And having said that his own baptism was only with water, he next shows 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 shows 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.
Gregory the Dialogist (as quoted by Aquinas, AD 1274)AD 604
Catena Aurea by Aquinas
(Hom. 7. in Evan.) 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 connection 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.

(Mor. 15. sup. Job 20.) The fire of hell is here wonderfully expressed, for our earthly fire is kept up by heaping wood upon it, and cannot live unless supplied with fuel, but on the contrary the fire of hell, though a bodily fire, and burning bodily the wicked who are put into it, is not kept up by wood, but once made remains unquenchable.
BedeAD 735
On the Gospel of Luke
And he will gather his wheat into his barn, but the chaff he will burn with unquenchable fire. And the Lord himself ended the parable of the good seed, upon which the enemy man sowed tares, by saying: And in the time of the harvest, I will say to the reapers: Gather first the tares, and bind them in bundles to burn; but gather the wheat into my barn (Matthew XIII). Clearly teaching that the impious and sinners will be delivered to the fire of Gehenna, while the holy will be crowned with heavenly glory. Indeed, this differs between the chaff and the tares: for the chaff comes forth from no other seed than the wheat, although it degenerates from the nobility of a good root. However, the tares differ not only by their fruit but are also generated from entirely different origins. The chaff are those who are imbued with the mystic rituals of the same faith as the elect, but they differ from their solid perfection, either by the lightness of their works or by the emptiness of their faithlessness. The tares, however, are those who are not even worthy to hear the words of faith, and thus, they are separated from the lot of the good, both in deeds and profession. And so, in this world's field, one is of the elect, and two are the fruits of the reprobate, since all that the enemy sows is subject to flames, and what is graver, many of those things which the good sower casts are either snatched by birds, dried out by the sun, choked by thorns, or certainly turned into chaff and perish. Only the wheat, created of good soil and proven worthy by patience, will be stored in the heavenly barn of the elect. Similarly, according to another parable, not only the fishes that decline the nets of Apostolic faith reside in the deep darkness of sinners, but many, dragged to the shore of extreme discretion among the good, then deserve to be sent to outer darkness because of their wickedness. He calls the fire of Gehenna unquenchable in two ways: that it can never be extinguished, nor will it ever cease to torment those whom it punishes, but will inflict (so to speak) an immortal death. This is in distinction to that most sacred fire, which he had earlier mentioned the elect of Christ would be baptized with. Concerning this, the Psalmist also says: You have tested us by fire, as silver is tested by fire (Psalm LXV). And a little later: We did not stay in that state forever, but we passed through fire and water, and you brought us into refreshment. I will enter into your house with burnt offerings (Ibid.), that is, the distresses of pressures conquered, I will penetrate the courts of your heavenly kingdom with thanksgiving.
BedeAD 735
On the Gospel of Luke
His winnowing fork is in his hand, and he will clear his threshing floor. By winnowing fork, that is, openly, the discernment of just judgment is meant; by the threshing floor, the present Church is prefigured. In which undoubtedly, which is sorrowful enough, many are called, but few are chosen (Matthew XX). Few grains are to be received into the heavenly mansions, in comparison to the weeds, which are to be consigned to perpetual flames. The purification of this threshing floor is also carried out now individually, when any perverse person is either cast out from the Church by priestly censure for manifest sins, or condemned after death by divine strictness for hidden sins, and it will be universally completed in the end, when the Son of Man will send his angels, and they will gather out of his kingdom all scandals. Therefore the Lord has the winnowing fork in hand, that is, the discernment of judgment in his power, because the Father judges no one, but has given all judgment to the Son.
Bede (as quoted by Aquinas, AD 1274)AD 735
Catena Aurea by Aquinas
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?

The Holy Spirit also may be understood by the word fire, for He kindles with love and enlightens with wisdom the hearts which He fills. Hence also the Apostles received the baptism of the Spirit in the appearance of fire. There are some who explain it, that now we are baptized with the Spirit, hereafter we shall be with fire, that as in truth we are now born again to the remission of our sins by water and the Spirit, so then we shall be cleansed from certain lighter sins by the baptism of purifying fire.

For by the floor is represented the present Church, in which many are called but few are chosen. The purging of which floor is even now carried on individually, when every perverse offender is either cast out of the Church for his open sins, (by the hands of the Priesthood,) or for his secret sins is after death condemned by Divine judgment. And at the end of the world it will be accomplished universally, when the Son of Man shall send His angels, and they shall gather out of His kingdom every thing that has offended.
Ancient Greek Expositor (as quoted by Aquinas, AD 1274)AD 1274
Catena Aurea by Aquinas
(ubi sup.) By these words then, He shall baptize with the Holy Spirit, He signifies the abundance of His grace, the plenteousness of His mercy; but lest any should suppose that while to bestow abundantly is both in the power and will of the Creator, He will have no occasion to punish the disobedient, he adds, whose fan is in his hand, showing that He is not only the rewarder of the righteous, but the avenger of them that speak lies. But the fan expresses the promptitude of His judgment. For not with the process of passing sentence on trial, but in an instant and without any interval he separates those that are to be condemned from the company of those that are to be saved.
Source: Quotations drawn from early Church Fathers and historical Christian theologians (AD 100–1500). Some quotes address the surrounding passage context rather than this verse alone.
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