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King James Version
I am come to send fire on the earth; and what will I, if it be already kindled?
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KJV (with Strong's)
I am come G2064 to send G906 fire G4442 on G1519 the earth G1093; and G2532 what G5101 will I G2309, if G1487 it be G381 already G2235 kindled G381?
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Complete Jewish Bible
“I have come to set fire to the earth! And how I wish it were already kindled!
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Berean Standard Bible
I have come to ignite a fire on the earth, and how I wish it were already kindled!
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American Standard Version
I came to cast fire upon the earth; and what do I desire, if it is already kindled?
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World English Bible Messianic
“I came to throw fire on the earth. I wish it were already kindled.
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Geneva Bible (1599)
I am come to put fire on the earth, and what is my desire, if it be already kindled?
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Young's Literal Translation
`Fire I came to cast to the earth, and what will I if already it was kindled?
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In the KJVVerse 25,509 of 31,102

Study This Verse

SUMMARY

In Luke 12:49, Jesus declares His profound mission using the vivid imagery of fire, signaling that His advent is not primarily to bring worldly peace but to initiate a transformative, purifying, and often divisive spiritual work upon the earth. This statement reveals His intense desire for the rapid and widespread realization of this mission, emphasizing the urgency and powerful nature of the Kingdom of God He inaugurates.

CONTEXT

  • Literary Context: This potent declaration by Jesus is situated within a larger discourse in Luke's Gospel where He prepares His disciples for the challenging realities of following Him and the urgent nature of the Kingdom of God. Immediately preceding this verse, Jesus has been teaching on watchfulness and readiness for His return, using parables like the faithful and unfaithful servant in Luke 12:35-48. The "fire" statement serves as a dramatic transition, shifting the focus from individual readiness to the broader, disruptive impact of His mission on the world. It directly precedes His words about the inevitable division His coming would bring, as seen in Luke 12:51-53, clarifying that His mission was not to establish a superficial worldly peace but to ignite a spiritual transformation that would inevitably lead to conviction and separation among people.
  • Historical & Cultural Context: First-century Palestine was a land under Roman occupation, with many Jews longing for a Messiah who would bring political liberation and restore Israel's earthly kingdom. The expectation was often of a king who would bring peace and prosperity through military might. Jesus' declaration of bringing "fire" would have challenged these prevailing expectations, signaling a different kind of kingdom and a different kind of conflict. Fire, in the Old Testament, often symbolized divine judgment, purification, or the presence of God (e.g., the burning bush or the pillar of fire). The audience would have understood fire as a powerful, transformative, and often destructive force, setting the stage for Jesus to redefine the nature of His messianic work beyond political aspirations, towards spiritual and moral transformation.
  • Key Themes: Luke 12:49 contributes significantly to several major theological and narrative themes within the Gospel of Luke and the broader biblical narrative. Firstly, it underscores The Divisive Nature of the Gospel. The "fire" symbolizes the profound and often disruptive impact of Jesus' message, which necessitates a clear choice, thereby separating those who accept Him from those who reject Him. This spiritual division is a core aspect of His work, challenging existing structures, loyalties, and beliefs, much like a sword that divides. Secondly, it highlights Purification and Zeal. Fire in biblical imagery frequently represents purification, judgment, and fervent zeal. Jesus expresses an intense longing for this spiritual "fire" to be fully kindled—a desire for the rapid and widespread impact of His message and the work of the Holy Spirit to transform hearts, expose sin, and refine believers. It functions as a refiner's fire that purifies the righteous and consumes opposition. Lastly, the verse reveals Jesus' Intense Desire for His Mission. The rhetorical question, "and what will I, if it be already kindled?", is an expression of Jesus' passionate longing for the full realization of His mission. He yearns for the transformative power of the Gospel to spread rapidly and accomplish its purifying and separating work on earth, revealing His deep commitment to the Father's will and the establishment of His Kingdom.

EXPOSITION AND ANALYSIS

Key Word Analysis

  • come (Greek, érchomai', G2064): Middle voice of a primary verb meaning "to come or go" in a great variety of applications, literally and figuratively. Here, it signifies Jesus' intentional arrival and the purpose of His incarnate mission.
  • fire (Greek, pŷr', G4442): A primary word, literally "fire," but frequently used metaphorically in the New Testament. Its figurative meanings include divine judgment, purification, the power of the Holy Spirit, or intense zeal. In this context, it encompasses the transformative and often disruptive effects of the Gospel.
  • kindled (Greek, anáptō', G381): From ana and haptō, meaning "to enkindle" or "to light." It speaks to the initiation or spreading of the fire Jesus came to bring, emphasizing its active and pervasive nature.

Verse Breakdown

  • "I am come to send fire on the earth": This clause declares Jesus' primary purpose for His incarnation. The "fire" is not literal combustion but a powerful metaphor for the transformative, purifying, and divisive impact of His ministry and the Gospel message. It signifies the spiritual revolution He initiates, which will challenge the status quo, expose sin, and demand a decisive response from humanity. The "earth" refers to humanity or the world system, indicating the universal scope of this spiritual work.
  • "and what will I, if it be already kindled?": This is a rhetorical question expressing Jesus' profound and intense desire. It can be paraphrased as "How I wish it were already kindled!" or "Oh, that it were already ablaze!" It conveys His fervent longing for the full and swift realization of the "fire's" work—the widespread dissemination of the Gospel, the purification of believers, and the separation of those who accept Him from those who reject Him. It highlights His zeal for the Father's will and the establishment of His Kingdom.

Literary Devices

Luke 12:49 is rich in literary devices that amplify its profound message. The most prominent is Metaphor, where "fire" is used to represent the powerful, transformative, purifying, and often divisive impact of Jesus' ministry and the Gospel. This is not literal fire but a symbolic representation of the spiritual fervor, judgment, and purification that His coming unleashes. The phrase "what will I, if it be already kindled?" functions as an Idiom or a rhetorical question expressing intense desire, akin to "Oh, how I wish it were already ablaze!" This idiom conveys Jesus' fervent longing for the rapid and complete fulfillment of His mission. Furthermore, the statement carries an element of Hyperbole in its dramatic imagery, underscoring the radical and all-encompassing nature of the spiritual change Jesus intends to bring, which will affect the entire "earth."

THEOLOGICAL AND THEMATIC CONNECTIONS

Luke 12:49 reveals a crucial aspect of Jesus' mission: it is not one of comfortable peace but of profound spiritual transformation that inevitably leads to division and purification. The "fire" represents the Holy Spirit's convicting power, the refining work of God in believers' lives, and the judgment that will ultimately separate the righteous from the unrighteous. This divine activity, though sometimes uncomfortable, is essential for the advancement of God's Kingdom and the spiritual health of humanity. It underscores that true peace is not the absence of conflict but the presence of God's righteous rule, which often necessitates challenging existing loyalties and exposing hidden sin.

REFLECTION AND APPLICATION

Luke 12:49 challenges us to reconsider our expectations of the Christian life and the impact of the Gospel. Jesus' "fire" is not a gentle warmth but a powerful, purifying force that demands a decisive response. For believers, this means embracing the refining work of God in our lives, allowing the "fire" to expose our impurities, burn away our dross, and ignite a fervent zeal for His Kingdom. It calls us to a radical commitment that may lead to division even within our closest relationships, as the truth of the Gospel often separates those who embrace it from those who reject it. This verse also ignites within us a shared passion with Christ for the spread of His transformative message, urging us to participate actively in His mission with the same intensity He expressed. We are called not to seek worldly comfort but to be agents of this divine fire, bringing conviction, purification, and the urgent call to repentance to a world in need.

Questions for Reflection

  • What "dross" in my life is the "fire" of Christ seeking to purify?
  • How willing am I to embrace the potentially divisive nature of the Gospel in my relationships and daily life?
  • Do I share Jesus' fervent desire for the "fire" of His Kingdom to be fully kindled on earth, and how can I practically contribute to its spread?
  • In what ways might I be resisting the transformative work of the Holy Spirit, which often feels like a "fire" of conviction or refining?

FAQ

What does Jesus mean by "send fire on the earth"?

Answer: Jesus is using "fire" as a powerful metaphor, not referring to literal destruction. This "fire" represents the transformative, purifying, and often divisive impact of His ministry and the Gospel message. It symbolizes the Holy Spirit's power (as seen at Pentecost), the conviction of sin, the purification of believers, and the inevitable separation that occurs when people are confronted with the truth of God's Kingdom. It's a spiritual revolution that challenges existing loyalties and demands a decisive response from humanity, leading to a "burning" away of sin and a refining of faith.

What is the meaning of "and what will I, if it be already kindled?"

Answer: This is a rhetorical question, an idiomatic expression in Greek, conveying Jesus' intense desire or fervent wish. It's best understood as "How I wish it were already kindled!" or "Oh, that it were already ablaze!" It expresses Jesus' profound longing for the rapid and widespread realization of His mission's transformative effects—the full and swift spread of the Gospel, the purification of His followers, and the clear separation between those who accept Him and those who do not. It highlights His zeal for the Father's will to be accomplished on earth.

CHRIST-CENTERED FULFILLMENT

Luke 12:49 finds its ultimate fulfillment in the person and work of Jesus Christ, who is the very source and embodiment of this "fire." His coming initiated the spiritual conflagration that would purify His people and judge the world. The "fire" He brought was powerfully manifested at Pentecost, when the Holy Spirit descended as tongues of fire, igniting the church with divine power and zeal to spread the Gospel to the ends of the earth. This "fire" continues to work through the Holy Spirit, convicting the world of sin, righteousness, and judgment (John 16:8). Christ's mission, therefore, is not merely to offer a message but to unleash a transformative force that refines believers, making them more like Him (Malachi 3:2-3), and ultimately separates those who belong to Him from those who do not, culminating in the final judgment where Christ, as the righteous judge, will separate the sheep from the goats (Matthew 25:31-33). Thus, Jesus' fervent desire for the fire to be kindled speaks to His passion for the full establishment of His Kingdom and the consummation of His redemptive work.

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Commentary on Luke 12 verses 41–53

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

Here is, I. Peter's question, which he put to Christ upon occasion of the foregoing parable (Luk 12:41): "Lord, speakest thou this parable to us that are thy constant followers, to us that are ministers, or also to all that come to be taught by thee, to all the hearers, and in them to all Christians?" Peter was now, as often, spokesman for the disciples. We have reason to bless God that there are some such forward men, that have a gift of utterance; let those that are such take heed of being proud. Now Peter desires Christ to explain himself, and to direct the arrow of the foregoing parable to the mark he intended. He calls it a parable, because it was not only figurative, but weighty, solid, and instructive. Lord, said Peter, was it intended for us, or for all? To this Christ gives a direct answer (Mar 13:37): What I say unto you, I say unto all. Yet here he seems to show that the apostles were primarily concerned in it. Note, We are all concerned to take to ourselves what Christ in his word designs for us, and to enquire accordingly concerning it: Speakest thou this to us? To me? Speak, Lord, for thy servant hears. Doth this word belong to me? Speak it to my heart.

II. Christ's reply to this question, directed to Peter and the rest of the disciples. If what Christ had said before did not so peculiarly concern them, but in common with other Christians, who must all watch and pray for Christ's coming, as his servants, yet this that follows is peculiarly adapted to ministers, who are the stewards in Christ's house. Now our Lord Jesus here tells them,

1.What was their duty as stewards, and what the trust committed to them. (1.) They are made rulers of God's household, under Christ, whose own the house is; ministers derive an authority from Christ to preach the gospel, and to administer the ordinances of Christ, and apply the seals of the covenant of grace. (2.) Their business is to give God's children and servants their portion of meat, that which is proper for them and allotted to them; convictions and comfort to those to whom they respectively belong. Suum cuique - to every one his own. This is rightly to divide the word of truth, Ti2 2:15. (3.) To give it to them in due season, at that time and in that way which are most suitable to the temper and condition of those that are to be fed; a word in season to him that is weary. (4.) Herein they must approve themselves faithful and wise; faithful to their Master, by whom this great trust is reposed in them, and faithful to their fellow-servants, for whose benefit they are put in trust; and wise to improve an opportunity of doing honour to their Master, and service in the family. Ministers must be both skilful and faithful.

2.What would be their happiness if they approved themselves faithful and wise (Luk 12:43): Blessed is that servant, (1.) That is doing, and is not idle, nor indulgent of his ease; even the rulers of the household must be doing, and make themselves servants of all. (2.) That is so doing, doing as he should be, giving them their portion of meat, by public preaching and personal application. (3.) That is found so doing when his Lord comes; that perseveres to the end, notwithstanding the difficulties he may meet with in the way. Now his happiness is illustrated by the preferment of a steward that has approved himself within a lower and narrower degree of service; he shall be preferred to a larger and higher (Luk 12:44): He will make him ruler over all that he has, which was Joseph's preferment in Pharaoh's court. Note, Ministers that obtain mercy of the Lord to be faithful shall obtain further mercy to be abundantly rewarded for their faithfulness in the day of the Lord.

3.What a dreadful reckoning there would be if they were treacherous and unfaithful, Luk 12:45, Luk 12:46. If that servant begin to be quarrelsome and profane, he shall be called to an account, and severely punished. We had all this before in Matthew, and therefore shall here only observe, (1.) Our looking upon Christ's second coming as a thing at a distance is the cause of all those irregularities which render the thought of it terrible to us: He saith in his heart, My Lord delays his coming. Christ's patience is very often misinterpreted his delay, to the discouragement of his people, and the encouragement of his enemies. (2.) The persecutors of God's people are commonly abandoned to security and sensuality; they beat their fellow-servants, and then eat and drink with the drunken, altogether unconcerned either at their own sin or their brethren's sufferings, as the king and Haman, who sat down to drink when the city Shushan was perplexed. Thus they drink, to drown the clamours of their own consciences, and baffle them, which would otherwise fly in their faces. (3.) Death and judgment will be very terrible to all wicked people, but especially to wicked ministers. It will be a surprise to them: At an hour when they are not aware. It will be the determining of them to endless misery; they shall be cut in sunder, and have their portion assigned them with the unbelievers.

4.What an aggravation it would be of their sin and punishment that they knew their duty, and did not do it (Luk 12:47, Luk 12:48): That servant that knew his lord's will, and did it not, shall be beaten with many stripes, shall fall under a sorer punishment; and he that knew not shall be beaten with few stripes, his punishment shall, in consideration of this, be mitigated. Here seems to be an allusion to the law, which made a distinction between sins committed through ignorance, and presumptuous sins (Lev 5:15, etc.; Num 15:29, Num 15:30), as also to another law concerning the number of stripes given to a malefactor, to be according to the nature of the crime, Deu 25:2, Deu 25:3. Now, (1.) Ignorance of our duty is an extenuation of sin. He that knew not his lord's will, through carelessness and neglect, and his not having such opportunities as some others had of coming to the knowledge of it, and did things worthy of stripes, he shall be beaten, because he might have known his duty better, but with few stripes; his ignorance excuses in part, but not wholly. Thus through ignorance the Jews put Christ to death (Act 3:17; Co1 2:8), and Christ pleaded that ignorance in their excuse: They know not what they do. (2.) The knowledge of our duty is an aggravation of our sin: That servant that knew his lord's will, and yet did his own will, shall be beaten with many stripes. God will justly inflict more upon him for abusing the means of knowledge he afforded him, which others would have made a better use of, because it argues a great degree of wilfulness and contempt to sin against knowledge; of how much sorer punishment then shall they be thought worthy, besides the many stripes that their own consciences will give them! Son, remember. Here is a good reason for this added: To whomsoever much is given, of him shall be much required, especially when it is committed as a trust he is to account for. Those have greater capacities of mind than others, more knowledge and learning, more acquaintance and converse with the scriptures, to them much is given, and their account will be accordingly.

III. A further discourse concerning his own sufferings, which he expected, and concerning the sufferings of his followers, which he would have them also to live in expectation of. In general (Luk 12:49): I am come to send fire on the earth. By this some understand the preaching of the gospel, and the pouring out of the Spirit, holy fire; this Christ came to send with a commission to refine the world, to purge away its dross, to burn up its chaff, and it was already kindled. The gospel was begun to be preached; some prefaces there were to the pouring out of the Spirit. Christ baptized with the Holy Ghost and with fire; this Spirit descended in fiery tongues. But, by what follows, it seems rather to be understood of the fire of persecution. Christ is not the Author of it, as it is the sin of the incendiaries, the persecutors; but he permits it, nay, he commissions it, as a refining fire for the trial of the persecuted. This fire was already kindled in the enmity of the carnal Jews to Christ and his followers. "What will I that it may presently be kindled? What thou doest, do quickly. If it be already kindled, what will I? Shall I wait the quenching of it? No, for it must fasten upon myself, and upon all, and glory will redound to God from it."

1.He must himself suffer many things; he must pass through this fire that was already kindled (Luk 12:50): I have a baptism to be baptized with. Afflictions are compared both to fire and water, Psa 66:12; Psa 69:1, Psa 69:2. Christ's sufferings were both. He calls them a baptism (Mat 20:22); for he was watered or sprinkled with them, as Israel was baptized in the cloud, and dipped into them, as Israel was baptized in the sea, Co1 10:2. He must be sprinkled with his own blood, and with the blood of his enemies, Isa 63:3. See here, (1.) Christ's foresight of his sufferings; he knew what he was to undergo, and the necessity of undergoing it: I am to be baptized with a baptism. He calls his sufferings by a name that mitigates them; it is a baptism, not a deluge; I must be dipped in them, not drowned in them; and by a name that sanctifies them, for baptism is a name that sanctifies them, for baptism is a sacred rite. Christ in his sufferings devoted himself to his Father's honour, and consecrated himself a priest for evermore, Heb 7:27, Heb 7:28. (2.) Christ's forwardness to his sufferings: How am I straitened till it be accomplished! He longed for the time when he should suffer and die, having an eye to the glorious issue of his sufferings. It is an allusion to a woman in travail, that is pained to be delivered, and welcomes her pains, because they hasten the birth of the child, and wishes them sharp and strong, that the work may be cut short. Christ's sufferings were the travail of his soul, which he cheerfully underwent, in hope that he should by them see his seed, Isa 53:10, Isa 53:11. So much was his heart set upon the redemption and salvation of man.

2.He tells those about him that they also must bear with hardships and difficulties (Luk 12:51): "Suppose ye that I came to give peace on earth, to give you a peaceable possession of the earth, and outward prosperity on the earth?" It is intimated that they were ready to entertain such a thought as this, nay, that they went upon this supposition, that the gospel would meet with a universal welcome, that people unanimously embrace it, and would therefore study to make the preachers of it easy and great, that Christ, if he did not give them pomp and power, would at least give them peace; and herein they were encouraged by divers passages of the Old Testament, which speak of the peace of the Messiah's kingdom, which they were willing to understand of external peace. "But," saith Christ, "you will be mistaken, the event will declare the contrary, and therefore do not flatter yourselves into a fool's paradise. You will find,"

(1.)"That the effect of the preaching of the gospel will be division." Not but that the design of the gospel and its proper tendency are to unite the children of men to one another, to knit them together in holy love, and, if all would receive it, this would be the effect of it; but there being multitudes that not only will not receive it, but oppose it, and have their corruptions exasperated by it, and are enraged at those that do receive it, it proves, though not the cause yet the occasion of division. While the strong man armed kept his palace, in the Gentile world, his goods were at peace; all was quiet, for all went one way, the sects of philosophers agreed well enough, so did the worshippers of different deities; but when the gospel was preached, and many were enlightened by it, and turned from the power of Satan to God, then there was a disturbance, a noise and a shaking, Eze 37:7. Some distinguished themselves by embracing the gospel, and others were angry that they did so. Yea, and among them that received the gospel there would be different sentiments in minor things, which would occasion division; and Christ permits it for holy ends (Co1 11:18), that Christians may learn and practise mutual forbearance, Rom 14:1, Rom 14:2.

(2.)"That this division will reach into private families, and the preaching of the gospel will give occasion for discord among the nearest relations" (Luk 12:53): The father shall be divided against the son, and the son against the father, when the one turns Christian and the other does not; for the one that does turn Christian will be zealous by arguments and endearments to turn the other too, Co1 7:16. As soon as ever Paul was converted, he disputed, Act 9:29. The one that continues in unbelief will be provoked, and will hate and persecute the one that by his faith and obedience witnesses against, and condemns, his unbelief and disobedience. A spirit of bigotry and persecution will break through the strongest bonds of relation and natural affection; see Mat 10:35; Mat 24:7. Even mothers and daughters fall out about religion; and those that believe not are so violent and outrageous that they are ready to deliver up into the hands of the bloody persecutors those that believe, though otherwise very near and dear to them. We find in the Acts that, wherever the gospel came, persecution was stirred up; it was every where spoken against, and there was no small stir about that way. Therefore let not the disciples of Christ promise themselves peace upon earth, for they are sent forth as sheep in the midst of wolves.

Matthew Henry (1662–1714) — Commentary on the Whole Bible. This section covers verses 41–53. Public domain.
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TertullianAD 220
Against Marcion Book IV
Whom else than the God of retribution can I understand by Him who shall "beat His servants with stripes," either "few or many," and shall exact from them what He had committed to them? Whom is it suitable for me to obey, but Him who remunerates? Your Christ proclaims, "I am come to send fire on the earth." That most lenient being, the lord who has no hell, not long before had restrained his disciples from demanding fire on the churlish village.
Methodius of OlympusAD 311
Methodius Discourse VI. Agathe
For the flesh is truly, as it were, our five-lighted lamp, which the soul will bear like a torch, when it stands before Christ the Bridegroom, on the day of the resurrection, showing her faith springing out clear and bright through all the senses, as He Himself taught, saying.
Wicked demons who once fell from light; but when the Creator and Framer of all things had, as the most divine Paul says, laid hold of the seed of Abraham, and through him of the whole human race, He was made man for ever, and without change, in order that by His fellowship with us, and our joining on to Him, the ingress of sin into us might be stopped, its strength being broken by degrees, and itself as wax being melted, by that fire which the Lord, when He came, sent upon the earth.
Titus of Bostra (as quoted by Aquinas, AD 1274)AD 378
Catena Aurea by Aquinas
And we must here believe that Christ came down from heaven. For if He had come from earth to earth, He would not say, I came to send fire upon the earth.
Basil of CaesareaAD 379
CONCERNING BAPTISM 1.2
He also said, “I came to cast fire upon the earth; and would that it were already kindled!” These flaming words from the lips of our Lord Jesus Christ reveal the malice of sin. He also reveals the excellence of good actions performed for the glory of God and his Christ.… Then we are ready for the baptism of water, which is a type of the cross, death, burial and resurrection from the dead.…One who is prepared to be baptized in the name of the Holy Spirit is one who has been born anew, who undergoes a change of residence, habits and associates so that, walking by the Spirit, he may be ready to be baptized in the name of the Son and to put on Christ.
Cyril of JerusalemAD 386
Catechetical Lecture 17:8
Why is it “fire”? It is because the descent of the Holy Spirit was in fiery tongues. Concerning this the Lord says with joy, “I came to cast fire upon the earth, and would that it were already kindled!”
Ambrose of Milan (as quoted by Aquinas, AD 1274)AD 397
Catena Aurea by Aquinas
To stewards, that is, to Priests, the preceding words seem to have been addressed, that they may thereby know that hereafter a heavier punishment awaits them, if, intent upon the world's pleasures, they have neglected the charge of their Lord's household, and the people entrusted to their care. But as it profiteth little to be recalled from error by the fear of punishment, and far greater is the privilege of charity and love, our Lord therefore kindles in men the desire of acquiring the divine nature, saying, I came to send fire on earth, not indeed that He is the Consumer of good men, but the Author of good will, who purifies the golden vessels of the Lord's house, but burns up the straw and stubble.

But so great was our Lord's condescension, that He tells us He has a desire of inspiring us with devotion, of accomplishing perfection in us, and of hastening His passion for us; as it follows, And how am I straitened till it be accomplished?
Ambrose of MilanAD 397
Isaac, or the Soul, 8.77
Therefore, good charity having the wings of a burning fire, which flies through the chests and hearts of the saints, and consumes whatever is material and earthly: it tests whatever is sincere, and improves whatever it touches with its fire. This fire the Lord Jesus sent upon the earth, and faith shone forth, devotion was kindled, charity was illuminated, justice shone brightly. With this fire, he inflamed the hearts of his apostles, as Cleophas testifies, saying: Was not our heart burning within us, while he opened the Scriptures? Therefore, the flames of the scriptures are divine.
Pseudo-ClementAD 400
Recognitions (Book VI)
On this account, therefore, He said, 'I have come to send fire on the earth; and how I wish that it were kindled!' [Luke 12:49] There is therefore a certain fight, which is to be fought by us in this life; for the word of truth and knowledge necessarily separates men from error and ignorance, as we have often seen putrified and dead flesh in the body separated by the cutting knife from its connection with the living members.
John Chrysostom (as quoted by Aquinas, AD 1274)AD 407
Catena Aurea by Aquinas
For by the earth He now means not that which we tread under our feet, but that which was fashioned by His hands, namely, man, upon whom the Lord pours out fire for the consuming of sins, and the renewing of souls.

(non occ.) Now hereby He declared a future event, for it so happened in the same house that there have been believers whose fathers wished to bring them to unbelief; but the power of Christ's doctrines has so prevailed, that fathers were left by sons, mothers by daughters, and children by parents. For the faithful in Christ were content not only to despise their own, but at the same time also to suffer all things as long as they were not without the worship of their faith. But if He were mere man, how would it have occurred to Him to conceive it possible that He should be more loved by fathers than their children were, by children than their fathers, by husbands than their wives, and they too not in one house or a hundred, but throughout the world? And not only did he predict this, but accomplish it in deed.
Cyril of AlexandriaAD 444
COMMENTARY ON LUKE, HOMILY 94
We affirm that the fire that Christ sent out is for humanity's salvation and profit. May God grant that all our hearts be full of this. The fire is the saving message of the gospel and the power of its commandments. We were cold and dead because of sin and in ignorance of him who by nature is truly God. The gospel ignites all of us on earth to a life of piety and makes us fervent in spirit, according to the expression of blessed Paul. Besides this, we are also made partakers of the Holy Spirit, who is like fire within us. We have been baptized with fire and the Holy Spirit. We have learned the way from what Christ says to us. Listen to his words: "Truly I say to you, that except a man be born of water and spirit, he cannot see the kingdom of God."It is the divinely inspired Scripture's custom to give the name of fire sometimes to the divine and sacred words and to the efficacy and power which is by the Holy Spirit by which we are made fervent in spirit.
Cyril of Alexandria (as quoted by Aquinas, AD 1274)AD 444
Catena Aurea by Aquinas
Now it is the way of holy Scripture to use sometimes the term fire, of holy and divine words. For as they who know how to purify gold and silver, destroy the dross by fire, so the Saviour by the teaching of the Gospel in the power of the Spirit cleanses the minds of those who believe in Him. This then is that wholesome and useful fire by which the inhabitants of earth, in a manner cold and dead through sin, revive to a life of piety.
Gregory the DialogistAD 604
Forty Gospel Homilies, Homily 30
Of this fire the Truth says: "I came to cast fire upon the earth, and what do I desire except that it burn?" For earthly hearts are called earth, which, while they always heap up base thoughts within themselves, are trampled by malignant spirits. But the Lord casts fire upon the earth when He kindles the hearts of carnal people with the breath of the Holy Spirit. And the earth burns when the carnal heart, cold in its wicked pleasures, abandons the desires of the present age and is set ablaze with love of God. Rightly therefore the Spirit appeared in fire, since from every heart He fills He shakes off the torpor of coldness and kindles it with desire for His eternity.
Gregory the Dialogist (as quoted by Aquinas, AD 1274)AD 604
Catena Aurea by Aquinas
(in Ezech. lib. i. Hom. 2.) Or else, fire is sent upon the earth, when by the fiery breath of the Holy Spirit, the earthly mind has all its carnal desires burnt up, but inflamed with spiritual love, bewails the evil it has done; and so the earth is burnt, when the conscience accusing itself, the heart of the sinner is consumed in the sorrow of repentance.
Gregory the DialogistAD 604
Forty Gospel Homilies, Homily 33
The mercy of the Redeemer has tempered for us the severity of the law. For in it was written: If anyone does this or that, let him surely die. If anyone does these or those things, let him be overwhelmed with stones. Our Creator and Redeemer appeared in the flesh, promising not punishment but life to the confession of sinners. Hence it is also well written in the law that the hands of Moses were heavy; therefore taking a stone, they placed it underneath, upon which he sat; and Aaron and Hur supported his hands. Moses indeed sat upon a stone, when the law rested upon the Church. But this same law had heavy hands, because it did not mercifully bear with sinners, but struck them with severe punishment. Aaron means mountain of strength, and Hur means fire. Whom therefore does this mountain of strength signify, if not our Redeemer, of whom it is said through the prophet: In the last days the mountain of the house of the Lord shall be prepared on the top of the mountains? Or who is figured by fire, if not the Holy Spirit, of whom the same Redeemer says: "I came to cast fire upon the earth"? Therefore Aaron and Hur support the heavy hands of Moses, and by supporting them render them lighter, because the Mediator of God and men, coming with the fire of the Holy Spirit, showed us through spiritual understanding that the heavy commandments of the law, which could not be borne while held carnally, are tolerable for us.
Bede (as quoted by Aquinas, AD 1274)AD 735
Catena Aurea by Aquinas
Or else, much is often given also to certain individuals, upon whom is bestowed the knowledge of God's will, and the means of performing what they know; much also is given to him to whom, together with his own salvation, is committed the care also of feeding our Lord's flock. Upon those then who are gifted with more abundant grace a heavier penalty falls; but the mildest punishment of all will be theirs, who, beyond the guilt they originally contracted, have added none besides; and in all who have added, theirs will be the more tolerable who have committed fewest iniquities.

But He adds, I have a baptism to be baptized with, that is, I have first to be sprinkled with the drops of My own Blood, and then to inflame the hearts of believers by the fire of the Spirit.

Some manuscripts have, "And how am I anguished," (coangor) that is, grieved. For though He had in Himself nothing to grieve Him, yet was He afflicted by our woes, and at the time of death He betrayed the anguish which He underwent not from the fear of His death, but from the delay of our redemption. For he who is troubled until he reaches perfection, is secure of perfection, for the condition of bodily affections not the dread of death offends him. For ho who has put on the body must suffer all things which are of the body, hunger, thirst, vexation, sorrow; but the Divine nature knows no change from such feelings. At the same time He also shows, that in the conflict of suffering consists the death of the body, peace of mind has no struggle with grief.

But the manner in which after the baptism of His passion and the coming of the spiritual fire the earth will be burnt, He declares as follows, Suppose ye that I am to give peace, &c.

Or in another way. By three are signified those who have faith in the Trinity, by two the unbelievers who depart from the unity of the faith. But the father is the devil, whose children we were by following him, but when that heavenly fire came down, it separated us from one another, and showed us another Father who is in heaven. The mother is the Synagogue, the daughter is the Primitive Church, who had to bear the persecution of that same synagogue, from whom she derived her birth, and whom she did herself in the truth of the faith contradict. The mother in law is the Synagogue, the daughter in law the Gentile Church, for Christ the husband of the Church is the son of the Synagogue, according to the flesh. The Synagogue then was divided both against its daughter in law, and its daughter, persecuting believers of each people. But they also were divided against their mother in law and mother, because they wished to abolish the circumcision of the flesh.
BedeAD 735
On the Gospel of Luke
I came to cast fire upon the earth, and what do I wish except that it be kindled? This sentence responds particularly to the question of the blessed Peter inquiring whether the state of a stricter life should be sought by all. Indeed, he says fire is the fervor of the Holy Spirit, which, illuminating the secrets of the heart, provokes with continuous motions towards heavenly things, burns away the vices of carnal desire like thorns and thistles, improves by refining the golden vessels of the Lord’s house, and consumes the wood, hay, and stubble; which, as soon as it was sent to the earth, fertilized those hundred and twenty lamps found in the stronghold of Zion with an intimate sprinkling of its light. Of which, when he said above, "Let your loins be girded" (Luke XII), he added, "And your lamps burning." Therefore, you ask (he says) whether I advise all to await the Lord’s coming with loins girded and lamps burning: but since for this reason alone I came forth from the Father’s bosom and came into the world, that I might kindle men from earthly desires to heavenly desires, what do you think I wish other than that the radiance of this fire illuminates all regions of the world, that the flame of this devotion always grows in the hearts of the faithful until the end of the age, and that it is neither extinguished by any incursions of the faithless nor by waves or gusts?
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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