First Reading — Acts 4:32-37
Irenaeus
On 4:33
The whole Church, it is then said, "when they had heard that, lifted up the voice to God with one accord, and said, Lord, Thou art God, which hast made heaven, and earth, and the sea, and all that in them is; who, through the Holy Ghost, by the mouth of our father David, Thy servant, hast said, Why did the heathen rage, and the people imagine vain things? The kings of the earth stood up, and the rulers were gathered together against the Lord, and against His Christ. For of a truth, in this city, against Thy holy Son Jesus, whom Thou hast anointed, both Herod and Pontius Pilate, with the Gentiles, and the people of Israel, were gathered together, to do whatsoever Thy hand and Thy counsel determined before to be done." These [are the] voices of the Church from which every Church had its origin; these are the voices of the metropolis of the citizens of the new covenant; these are the voices of the apostles; these are voices of the disciples of the Lord, the truly perfect, who, after the assumption of the Lord, were perfected by the Spirit, and called upon the God who made heaven, and earth, and the sea,-who was announced by the prophets,-and Jesus Christ His Son, whom God anointed, and who knew no other [God]. For at that time and place there was neither Valentinus, nor Marcion, nor the rest of these subverters [of the truth], and their adherents. Wherefore God, the Maker of all things, heard them. For it is said, "The place was shaken where they were assembled together; and they were all filled with the Holy Ghost, and they spake the word of God with boldness" to every one that was willing to believe. "And with great power," it is added, "gave the apostles witness of the resurrection of the Lord Jesus," saying to them, "The God of our fathers raised up Jesus, whom ye seized and slew, hanging [Him] upon a beam of wood: Him hath God raised up by His right hand to be a Prince and Saviour, to give repentance to Israel, and forgiveness of sins. And we are in this witnesses of these words; as also is the Holy Ghost, whom God hath given to them that believe in Him." "And daily," it is said, "in the temple, and from house to house, they ceased not to teach and preach Christ Jesus," the Son of God. For this was the knowledge of salvation, which renders those who acknowledge His Son's advent perfect towards God.
Responsorial Psalm — Psalm 93:1ab, 1cd-2, 5
Tyrannius Rufinus
On 92:2
To sit at the right hand of the Father is a mystery belonging to the incarnation. For it does not befit that incorporeal nature without the assumption of flesh; neither is the excellency of a heavenly seat sought for the divine nature but for the human. Thus it is said of him, "Your seat, O God, is prepared from thence forward; you are from everlasting." The seat, then, on which the Lord Jesus was to sit, was prepared from everlasting, "in whose name every knee should bow, of things in heaven and things on earth and things under the earth; and every tongue shall confess to him that Jesus is Lord in the glory of God the Father;" of whom also David says, "The Lord said to my Lord, Sit on my right hand until I make your enemies your footstool." Referring to these words the Lord in the Gospel said to the Pharisees, "If therefore David in spirit calls him Lord, how is he his Son?" By which [Jesus Christ] showed that according to the Spirit he was the Lord, according to the flesh he was the Son of David. Also the Lord says in another place, "Truly I say to you, henceforth you shall see the Son of man sitting at the right hand of the power of God." And the apostle Peter says of Christ, "Who is on the right hand of God, seated in the heavens." And Paul also, writing to the Ephesians, "According to the working of the might of his power, which he wrought in Christ, when he raised him from the dead and seated him on his right hand."
Gospel — John 3:7b-15
Hilary of Poitiers
On 3:13
(de Trin. c. 16.) Or, His descending from heaven is the source of His origin as conceived by the Spirit: Mary gave not His body its origin, though the natural qualities of her sex contributed its birth and increase. That He is the Son of man is from the birth of the flesh which was conceived in the Virgin. That He is in heaven is from the power of His everlasting nature, which did not contract the power of the Word of God, which is infinite, within the sphere of a finite body. Our Lord remaining in the form of a servant, far from the whole circle, inner and outer, of heaven and the world, yet as Lord of heaven and the world, was not absent therefrom. So then He came down from heaven because He was the Son of man; and He was in heaven, because the Word, which was made flesh, had not ceased to be the Word.