First Reading — Acts 4:32-35
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 118:2-4, 13-15, 22-24
Clement of Rome
On 117:19–20
Let us therefore root this out quickly, and let us fall down before the Master and entreat him with tears, that he may show himself propitious and be reconciled to us and may restore us to the seemly and pure conduct that belongs to our love of the brothers. For this is a gate of righteousness opened to life, as it is written: "Open to me the gates of righteousness, that I may enter in thereby and praise the Lord. This is the gate of the Lord; the righteous shall enter in thereby." Seeing then that many gates are opened, this is that gate that is in righteousness, even that which is in Christ, whereby all are blessed who have entered in and direct their path in holiness and righteousness, performing all things without confusion. Let a person be faithful, let him be able to expound a deep saying, let him be wise in the discernment of words, let him be strenuous in deeds, let him be pure; for so much the more ought he to be lowly in mind, in proportion as he seems to be the greater; and he ought to seek the common advantage of all, and not his own.
Second Reading — 1 John 5:1-6
Irenaeus
On 5:1
All, therefore, are outside of the [Christian] dispensation, who, under pretext of knowledge, understand that Jesus was one, and Christ another, and the Only-begotten another, from whom again is the Word, and that the Saviour is another, whom these disciples of error allege to be a production of those who were made Aeons in a state of degeneracy. Such men are to outward appearance sheep; for they appear to be like us, by what they say in public, repeating the same words as we do; but inwardly they are wolves. Their doctrine is homicidal, conjuring up, as it does, a number of gods, and simulating many Fathers, but lowering and dividing the Son of God in many ways. These are they against whom the Lord has cautioned us beforehand; and His disciple, in his Epistle already mentioned, commands us to avoid them, when he says: "For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist. Take heed to them, that ye lose not what ye have wrought." And again does he say in the Epistle: "Many false prophets are gone out into the world. Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God; and every spirit which separates Jesus Christ is not of God, but is of antichrist." These words agree with what was said in the Gospel, that "the Word was made flesh, and dwelt among us." Wherefore he again exclaims in his Epistle, "Every one that believeth that Jesus is the Christ, has been born of God;" knowing Jesus Christ to be one and the same, to whom the gates of heaven were opened, because of His taking upon Him flesh: who shall also come in the same flesh in which He suffered, revealing the glory of the Father.
On 5:6
Moreover, how could the Lord, with any justice, if He belonged to another father, have acknowledged the bread to be His body, while He took it from that creation to which we belong, and affirmed the mixed cup to be His blood? And why did He acknowledge Himself to be the Son of man, if He had not gone through that birth which belongs to a human being? How, too, could He forgive us those sins for which we are answerable to our Maker and God? And how, again, supposing that He was not flesh, but was a man merely in appearance, could He have been crucified, and could blood and water have issued from His pierced side? What body, moreover, was it that those who buried Him consigned to the tomb? And what was that which rose again from the dead?
Gospel — John 20:19-31
John Chrysostom
On 20:19
(Hom. lxxxvi) The disciples, when they heard what Mary told them, were obliged either to disbelieve, or, if they believed, to grieve that He did not count them worthy to have the sight of Him. He did not let them however pass a whole day in such reflections, but in the midst of their longing trembling desires to see Him, presented Himself to them: Then the same day at evening, being the first day of the week, when the doors were shut where the disciples were assembled for fear of the Jews.
On 20:19
(Hom. lxxxvi) It is wonderful that they did not think him a phantom. But Mary had provided against this, by the faith she had wrought in them. And He Himself too shewed Himself so openly, and strengthened their wavering minds by His voice: And saith unto them, Peace he unto you, i. e. Be not disturbed. Wherein too He reminds them of what He had said before His crucifixion; My peace I give to you; (c. 14:27; 16:33) and again, In Me ye shall have peace.
On 20:19
(Hom. lxxxvi) All these things brought them to a most confident faith. As they were in endless war with the Jews, He says again, Then said Jesus unto them again, Peace be unto you.
On 20:20
(Hom. lxxxvi) And what He had promised before the crucifixion, I shall see you again, and your heart shall rejoice, is now fulfilled: Then were the disciples glad when they saw the Lord.
On 20:21
(Hom. lxxxvi. 3) At the same time He shews the efficacy of the cross, by which He undoes all evil things, and gives all good things; which is peace. To the women above there was announced joy; for that sex was in sorrow, and had received the curse, In sorrow shalt thou bring forth. (Gen. 3:16) All hindrances then being removed, and every thing made straight, (πατωρθωται.) he adds, As My Father hath sent Me, even so send I you.
On 20:22
(Hom. lxxxvi. 2) Having then given them confidence by His own miracles, and appealing to Him who sent Him, He uses a prayer to the Father, but of His own authority gives them power: And when He had said thus, He breathed on them, and saith unto them, Receive ye the Holy Ghost.
On 20:23
(Hom. lxxxvi) Some say that by breathing He did not give them the Spirit, but made them meet to receive the Spirit. For if Daniel’s senses were so overpowered by the sight of the Angel, how would they have been overwhelmed in receiving that unutterable gift, if He had not first prepared them for it! It would not be wrong however to say that they received then the gift of a certain spiritual power, not to raise the dead and do miracles, but to remit sins: Whosesoever sins ye remit, they are remitted unto them, and whosesoever sins ye retain, they are retained.
On 20:24
(Hom. lxxxvi. 4) A priest though he may have ordered well his own life, yet, if he have not exercised proper vigilance over others, is sent to hell with the evil doers. Wherefore, knowing the greatness of their danger, pay them all respect, even though they be not men of notable goodness. For they who are in rule, should not be judged by those who are under them. And their incorrectness of life will not at all invalidate what they do by commission from God. For not only cannot a priest, but not even angel or archangel, do any thing of themselves; the Father, Son, and Holy Ghost do all. The priest only furnishes the tongue, and the hand. For it were not just that the salvation of those who come to the Sacraments in faith, should be endangered by another’s wickedness. (Hom. lxxxvii. 1). At the assembly of the disciples all were present but Thomas, who probably had not returned from the dispersion: But Thomas, one of the twelve, called Didymus, was not with them when Jesus came.
On 20:25
(Hom. lxxxvii. 1) As to believe directly, (ἁπλῶς) and any how, is the mark of too easy a mind, so is too much enquiring of a gross one: and this is Thomas’s fault. For when the Apostle said, We have seen the Lord, he did not believe, not because he discredited them, but from an idea of the impossibility of the thing itself: The other disciples therefore said unto him, We have seen the Lord. But he said unto them, Except I shall see in His hands the print of the nails, and put my finger into the print of the nails, and thrust my hand into His side, I will not believe. Being the grossest of all, he required the evidence of the grossest sense, viz. the touch, and would not even believe his eyes: for he does not say only, Except I shall see, but adds, and put my finger into the print of the nails, and thrust my hand into His side.
On 20:26
(Hom. lxxxvii) Consider the mercy of the Lord, how for the sake of one soul, He exhibits His wounds. And yet the disciples deserved credit, and He had Himself foretold the event. Notwithstanding, because one person, Thomas, would examine Him, Christ allowed him. But He did not appear to him immediately, but waited till the eighth day, in order that the admonition being given in the presence of the disciples, might kindle in him greater desire, and strengthen his faith for the future. And after eight days again His disciples were within, and Thomas with them: then came Jesus, the doors being shut, and stood in the midst, and said, Peace be unto you.
On 20:26
(Hom. lxxxvii) John having related less than the other Evangelists, adds, And many other signs truly did Jesus in the presence of His disciples, which are not written in this book. Yet neither did the others relate all, but only what was sufficient for the purpose of convincing men. He probably here refers to the miracles which our Lord did after His resurrection, and therefore says, In the presence of His disciples, and they being the only persons with whom He conversed after His resurrection. Then to let you understand, that the miracles were not done for the sake of the disciples only, He adds, But these are written, that ye might believe that Jesus is the Christ, the Son of God; addressing Himself to mankind generally. And, this belief, he then says, profits ourselves, not Him in Whom we believe. And that believing ye might have life through His name, i. e. through Jesus, which is life.
On 20:27
(Hom. lxxxvii. 1) Jesus then comes Himself, and does not wait till Thomas interrogates Him. But to shew that He heard what Thomas said to the disciples, He uses the same words. And first He rebukes him; Then saith He to Thomas, Reach hither thy finger, and behold My hands; and reach hither thy hand, and thrust it into My side: secondly, He admonishes him; And be not faithless, but believing. Note how that before they receive the Holy Ghost faith wavers, but afterward is firm. We may wonder how an incorruptible body could retain the marks of the nails. But it was done in condescension; in order that they might be sure that it was the very person Who was crucified.
On 20:29
(Hom. lxxxvii) If any one then says, Would that I had lived in those times, and seen Christ doing miracles! let him reflect, Blessed are they that have not seen, and yet have believed.