First Reading — Acts 2:42-47
Irenaeus
On 2:44
And the class of oblations in general has not been set aside; for there were both oblations there [among the Jews], and there are oblations here [among the Christians]. Sacrifices there were among the people; sacrifices there are, too, in the Church: but the species alone has been changed, inasmuch as the offering is now made, not by slaves, but by freemen. For the Lord is [ever] one and the same; but the character of a servile oblation is peculiar [to itself], as is also that of freemen, in order that, by the very oblations, the indication of liberty may be set forth. For with Him there is nothing purposeless, nor without signification, nor without design. And for this reason they (the Jews) had indeed the tithes of their goods consecrated to Him, but those who have received liberty set aside all their possessions for the Lord's purposes, bestowing joyfully and freely not the less valuable portions of their property, since they have the hope of better things [hereafter]; as that poor widow acted who cast all her living into the treasury of 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 Peter 1:3-9
Polycarp of Smyrna
On 1:8
I have greatly rejoiced with you in our Lord Jesus Christ, because ye have followed the example of true love [as displayed by God], and have accompanied, as became you, those who were bound in chains, the fitting ornaments of saints, and which are indeed the diadems of the true elect of God and our Lord; and because the strong root of your faith, spoken of in days long gone by, endureth even until now, and bringeth forth fruit to our Lord Jesus Christ, who for our sins suffered even unto death, [but] "whom God raised from the dead, having loosed the bands of the grave." "In whom, though now ye see Him not, ye believe, and believing, rejoice with joy unspeakable and full of glory;" into which joy many desire to enter, knowing that "by grace ye are saved, not of works," but by the will of God through Jesus Christ.
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.