First Reading — Acts 15:7-21
Irenaeus
On 15:14
This is shown in a still clearer light from the letter of the apostles, which they forwarded neither to the Jews nor to the Greeks, but to those who from the Gentiles believed in Christ, confirming their faith. For when certain men had come down from Judea to Antioch-where also, first of all, the Lord's disciples were called Christians, because of their faith in Christ-and sought to persuade those who had believed on the Lord to be circumcised, and to perform other things after the observance of the law; and when Paul and Barnabas had gone up to Jerusalem to the apostles on account of this question, and the whole Church had convened together, Peter thus addressed them: "Men, brethren, ye know how that from the days of old God made choice among you, that the Gentiles by my mouth should hear the word of the Gospel, and believe. And God, the Searcher of the heart, bare them witness, giving them the Holy Ghost, even as to us; and put no difference between us and them, purifying their hearts by faith. Now therefore why tempt ye God, to impose a yoke upon the neck of the disciples, which neither our fathers nor we were able to bear? But we believe that, through the grace of our Lord Jesus Christ, we are to be saved, even as they." After him James spoke as follows: "Men, brethren, Simon hath declared how God did purpose to take from among the Gentiles a people for His name. And thus do the words of the prophets agree, as it is written, After this I will return, and will build again the tabernacle of David, which is fallen down; and I will build the ruins thereof, and I will set it up: that the residue of men may seek after the Lord, and all the Gentiles, among whom my name has been invoked, saith the Lord, doing these things. Known from eternity is His work to God. Wherefore I for my part give judgment, that we trouble not them who from among the Gentiles are turned to God: but that it be enjoined them, that they do abstain from the vanities of idols, and from fornication, and from blood; and whatsoever they wish not to be done to themselves, let them not do to others." ... From all these passages, then, it is evident that they did not teach the existence of another Father, but gave the new covenant of liberty to those who had lately believed in God by the Holy Spirit. But they clearly indicated, from the nature of the point debated by them, as to whether or not it were still necessary to circumcise the disciples, that they had no idea of another god.
On 15:15
This is shown in a still clearer light from the letter of the apostles, which they forwarded neither to the Jews nor to the Greeks, but to those who from the Gentiles believed in Christ, confirming their faith. ... After him James spoke as follows: "Men, brethren, Simon hath declared how God did purpose to take from among the Gentiles a people for His name. And thus do the words of the prophets agree, as it is written, After this I will return, and will build again the tabernacle of David, which is fallen down; and I will build the ruins thereof, and I will set it up: that the residue of men may seek after the Lord, and all the Gentiles, among whom my name has been invoked, saith the Lord, doing these things. Known from eternity is His work to God. Wherefore I for my part give judgment, that we trouble not them who from among the Gentiles are turned to God: but that it be enjoined them, that they do abstain from the vanities of idols, and from fornication, and from blood; and whatsoever they wish not to be done to themselves, let them not do to others." ... From all these passages, then, it is evident that they did not teach the existence of another Father, but gave the new covenant of liberty to those who had lately believed in God by the Holy Spirit. But they clearly indicated, from the nature of the point debated by them, as to whether or not it were still necessary to circumcise the disciples, that they had no idea of another god.
Responsorial Psalm — Psalm 96:1-2a, 2b-3, 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.
Gospel — John 15:9-11
John Chrysostom
On 15:10
(Hom. lxxvi. 2) If then I love you, be of good cheer; if it is the Father’s glory that ye bring forth good fruit, bear no evil. Then to rouse them to exertion, He adds, Continue ye in My love; and then shews how this is to be done: If ye keep My commandments, ye shall abide in My love.
On 15:11
(Hom. lxxvii. 1) Then because the Passion was now approaching to interrupt their joy, He adds, These things have I spoken unto you, that my joy may remain in you: as if He said, And if sorrow fall upon you, I will take it away; so that ye shall rejoice in the end.