I am come to send fire on the earth; and would that it were already kindled?
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Ambrose of Milan
AD 397
Love is good, having wings of burning fire that flies through the saints’ breasts and hearts and consumes whatever is material and earthly but tests whatever is pure. With its fire, love makes whatever it has touched better. The Lord Jesus sent this fire on earth. Faith shined brightly. Devotion was enkindled. Love was illuminated. Justice was resplendent. With this fire, he inflamed the heart of his apostles, as Cleophas bears witness, saying, “Was not our heart burning within is, while he was explaining the Scriptures?” The wings of fire are the flames of the divine Scripture. Isaac, or the Soul
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.
I came to came to cast fire on the earth; and what will I, if it is already kindled? The Arabic has, "What will I but that it be kindled?" So the Egyptian, Ethiopic, and Persian. It is uncertain whether Christ said this at the same time as the preceding. For S. Luke joins the words of Christ together, although spoken at different times. It may be connected with the preceding and following thus: Christ after much teaching of the Apostles and faithful, may, at last, have stated the primary duty that He was sent into the world by the Father to fulfil, namely, that He should send fire from heaven on the Apostles, that they, when inflamed by it, might kindle it in the rest of the other faithful; for by this the Apostles would fully and efficaciously perform the work that had been given them by Christ of evangelising the whole world and converting it to Him, and the faithful would exactly carry on the instructions of the Apostles.
Symbolically, S. Ambrose, on Ps. cxix. (Serm. viii.) says: "...
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. Commentary on Luke, Homily
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!” Catechetical Lectures
I am come to send fire on the earth. By this fire, some understand the light of the gospel, and the fire of charity and divine love. Others, the fire of trials and persecutions. (Witham)
What is the fire, which Christ comes to send upon the earth? Some understand it of the Holy Spirit, of the doctrine of the gospel, and the preaching of the apostles, which has filled the world with fervour and light, and which was signified by the flames of fire which appeared at the descent of the Holy Spirit upon the apostles. My words, says the Lord, in Jeremias, (Chap. xxiii. 29.) are as a fire, and as a hammer, that breaketh the rock in pieces. Others understand it of the fire of charity, which Christ came to enkindle upon the earth, and which the apostles carried throughout the whole world. But the most simple and literal opinion seems to be, the fire of persecution and war. Fire is often used in Scripture for war: and our Saviour declares in St. Matthew that he is come to bring the sword, and n...
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.