First Reading — Acts 5:12-16
Tertullian
On 5:13
For they both raised the dead, which God alone (can do), and restored the debilitated to their integrity, which none but Christ (can do); nay, they inflicted plagues too, which Christ would not do.
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 — Revelation 1:9-11a, 12-13, 17-19
Irenaeus
On 1:12
If, then, neither Moses, nor Elias, nor Ezekiel, who had all many celestial visions, did see God; but if what they did see were similitudes of the splendour of the Lord, and prophecies of things to come; it is manifest that the Father is indeed invisible, of whom also the Lord said, "No man hath seen God at any time." But His Word, as He Himself willed it, and for the benefit of those who beheld, did show the Father's brightness, and explained His purposes (as also the Lord said: "The only-begotten God, which is in the bosom of the Father, He hath declared [Him];" and He does Himself also interpret the Word of the Father as being rich and great); not in one figure, nor in one character, did He appear to those seeing Him, but according to the reasons and effects aimed at in His dispensations, as it is written in Daniel. For at one time He was seen with those who were around Ananias, Azarias, Misael, as present with them in the furnace of fire, in the burning, and preserving them from [the effects of] fire: "And the appearance of the fourth," it is said, "was like to the Son of God." At another time [He is represented as] "a stone cut out of the mountain without hands," and as smiting all temporal kingdoms, and as blowing them away, and as Himself filling all the earth. Then, too, is this same individual beheld as the Son of man coming in the clouds of heaven, and drawing near to the Ancient of Days, and receiving from Him all power and glory, and a kingdom. "His dominion," it is said, "is an everlasting dominion, and His kingdom shall not perish." John also, the Lord's disciple, when beholding the sacerdotal and glorious advent of His kingdom, says in the Apocalypse: "I turned to see the voice that spake with me. And, being turned, I saw seven golden candlesticks; and in the midst of the candlesticks One like unto the Son of man, clothed with a garment reaching to the feet, and girt about the paps with a golden girdle; and His head and His hairs were white, as white as wool, and as snow; and His eyes were as a flame of fire; and His feet like unto fine brass, as if He burned in a furnace. And His voice [was] as the voice of waters; and He had in His right hand seven stars; and out of His mouth went a sharp two-edged sword; and His countenance was as the sun shining in his strength." For in these words He sets forth something of the glory [which He has received] from His Father, as [where He makes mention of] the head; something in reference to the priestly office also, as in the case of the long garment reaching to the feet. And this was the reason why Moses vested the high priest after this fashion. Something also alludes to the end [of all things], as [where He speaks of] the fine brass burning in the fire, which denotes the power of faith, and the continuing instant in prayer, because of the consuming fire which is to come at the end of time.
On 1:15
Thus it was, too, that God formed man at the first, because of His munificence; but chose the patriarchs for the sake of their salvation; and prepared a people beforehand, teaching the headstrong to follow God; and raised up prophets upon earth, accustoming man to bear His Spirit [within him], and to hold communion with God: He Himself, indeed, having need of nothing, but granting communion with Himself to those who stood in need of it, and sketching out, like an architect, the plan of salvation to those that pleased Him. And He did Himself furnish guidance to those who beheld Him not in Egypt, while to those who became unruly in the desert He promulgated a law very suitable [to their condition]. Then, on the people who entered into the good land He bestowed a noble inheritance; and He killed the fatted calf for those converted to the Father, and presented them with the finest robe. Thus, in a variety of ways, He adjusted the human race to an agreement with salvation. On this account also does John declare in the Apocalypse, "And His voice as the sound of many waters." For the Spirit [of God] is truly [like] many waters, since the Father is both rich and great. And the Word, passing through all those [men], did liberally confer benefits upon His subjects, by drawing up in writing a law adapted and applicable to every class [among them].
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.