First Reading — Isaiah 45:1, 4-6
Tertullian
On 45:1
"Thus says the Lord God to my Christ [the] Lord, whose right hand I have held, that the nations may hear him, 'the powers of kings will I burst asunder; I will open before him the gates, and the cities shall not be closed to him.' " This very thing we see now fulfilled. For whose right hand does God the Father hold but Christ's, his Son? All nations have heard of him, that is, people of all nations have believed. Their preachers, the apostles, are pointed to in the psalms of David: "Into the entire earth," he says, "is gone out their sound, and to the ends of the earth their words." For on whom else have nations the world over believed but on the Christ who has now already come?… In all these places the name of the Christ has already come to reign. He is the one before whom the gates of all cities have been opened and to whom none are closed, before whom iron bars have been crumbled and brazen gates opened. There is a spiritual sense affixed to these expressions. The hearts of individuals, having been blockaded in various ways by the devil, are now unbarred by the faith of Christ. This promise has already been evidently fulfilled, inasmuch as in all these places there are people who live believing in the name of Christ.
On 45:6
And inasmuch as this Son is undivided and inseparable from the Father, so is he to be reckoned as being in the Father, even when he is not named. The fact is, if he had named him expressly, he would have separated him, saying in so many words, "Beside me there is none else, except my Son." In short, he would have made his Son actually another, after excepting him from others.
Responsorial Psalm — Psalm 96:1, 3, 4-5, 7-8, 9-10
Justin Martyr
On 95:1–3
Then Trypho said, "We know that you quoted these because we asked you. But it does not appear to me that this Psalm which you quoted last from the words of David refers to any other than the Father and Maker of the heavens and earth. You, however, asserted that it referred to Him who suffered, whom you also are eagerly endeavouring to prove to be Christ."
And I answered, "Attend to me, I beseech you, while I speak of the statement which the Holy Spirit gave utterance to in this Psalm; and you shall know that I speak not sinfully, and that we are not really bewitched; for so you shall be enabled of yourselves to understand many other statements made by the Holy Spirit. 'Sing unto the Lord a new song; sing unto the Lord, all the earth: sing unto the Lord, and bless His name; show forth His salvation from day to day, His wonderful works among all people.' He bids the inhabitants of all the earth, who have known the mystery of this salvation, i.e., the suffering of Christ, by which He saved them, sing and give praises to God the Father of all things, and recognise that He is to be praised and feared, and that He is the Maker of heaven and earth, who effected this salvation in behalf of the human race, who also was crucified and was dead, and who was deemed worthy by Him (God) to reign over all the earth. As [is clearly seen] also by the land into which [He said] He would bring [your fathers]; [for He thus speaks]: 'This people [shall go a whoring after other gods], and shall forsake Me, and shall break my covenant which I made with them in that day; and I will forsake them, and will turn away My face from them; and they shall be devoured, and many evils and afflictions shall find them out; and they shall say in that day, Because the Lord my God is not amongst us, these misfortunes have found us out. And I shall certainly turn away My face from them in that day, on account of all the evils which they have committed, in that they have turned to other gods.'
On 95:10
And from the ninety-fifth (ninety-sixth) Psalm they have taken away this short saying of the words of David: "From the wood." For when the passage said, "Tell ye among the nations, the Lord hath reigned from the wood," they have left, "Tell ye among the nations, the Lord hath reigned." Now no one of your people has ever been said to have reigned as God and Lord among the nations, with the exception of Him only who was crucified, of whom also the Holy Spirit affirms in the same Psalm that He was raised again, and freed from [the grave], declaring that there is none like Him among the gods of the nations: for they are idols of demons.
Second Reading — 1 Thessalonians 1:1-5b
Gregory of Nyssa
On 1:5
Thus, the obedient and responsive soul gives itself over to the virtuous life. This life is freedom itself, on the one hand, from the chains of this life, separating itself from the slavery of base and empty pursuits. On the other hand, this soul devotes itself to faith and the life of God alone, because it sees clearly that where there is faith, reverence and a blameless life, there is present the power of Christ, there is flight from all evil and from death which robs us of life. For shameful things do not have in themselves sufficient power to compete with the power of the Lord. It is their nature to develop from disobedience to his commands. This was experienced in ancient times by the first man, but now it is experienced by all of us when we imitate Adam's disobedience through stubborn choice. However, those who approach the Spirit with honest intent, unfeigned faith and an undefiled conscience, are cleansed by the Spirit according to the one who says, "for our gospel was not delivered to you in word only, but in power also; and in the Holy Spirit and in much fullness, as you know."
Gospel — Matthew 22:15-21
Origen
On 22:21
From this place we learn by the Saviour’s example not to be allured by those things which have many voices for them, and thence seem famous, but to incline rather to those things which are spoken according to some method of reason. But we may also understand this place morally, that we ought to give some things to the body as a tribute to Cæsar, that is to say, necessaries. And such things as are congenial to our souls’ nature, that is, such things as lead to virtue, those we ought to offer to God. They then who without any moderation inculcate the law of God, and command us to have no care for the things required by the body, are the Pharisees, who forbad to give tribute to Cæsar, forbidding to marry, and commanding to abstain from meats, which God hath created. (1 Tim. 4:3.) They, on the other hand, who allow too much indulgence to the body are the Herodians. But our Saviour would neither that virtue should be enfeebled by immoderate devotedness to the flesh; nor that our fleshly nature should be oppressed by our unremitting efforts after virtue. Or the prince of this world, that is, the Devil, is called Cæsar; and we cannot render to God the things that are God’s, unless we have first rendered to this prince all that is his, that is, have cast off all wickedness. This moreover let us learn from this place, that to those who tempt us we should neither be totally silent, nor yet answer openly, but with caution, to cut off all occasion from those who seek occasion in us, and teach without blame the things which may save those who are willing to be saved.