The interpretation timeline
John 20:21 Douay-Rheims

He said therefore to them again: Peace be to you. As the Father hath sent me, I also send you.

A.D. 407 – 1871 8 witnesses

Patristic

before A.D. 750
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“(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.”
Source
604
A.D.
Gregory the Great Patristic
c. A.D. 540–604
“(Hom. xxii. in Evang.) The Father sent the Son, appointed Him to the work of redemption. He says therefore, As My Father hath sent Me, even so send I you; i. e. I love you, now that I send you to persecution, with the same love wherewith My Father loved Me, when He sent Me to My sufferings.”

Scholastic

c. 1100 – 1500
1270
A.D.
Thomas Aquinas Catholic
1225–1274
“Having set forth the appearances of Christ made to the women, in this part the Evangelist deals with the appearances made to the apostles: first, the appearance in which he appeared to all of them together in Jerusalem, Thomas being absent; second, the one which took place with Thomas present, where it says "and after eight days," etc.; third, the one which was made to certain of them specially beside the sea, where in chapter 21 he later "manifested himself," etc. Concerning the first, two things are set down: first, the Lord's appearance; second, the disciples' doubt, where it says "But Thomas," etc. Concerning the first, three things are set down: first, the Lord's appearance; second, the enjoining of an office, where it says "He said to them, Peace be with you," etc.; third, the conferring of a spiritual gift, where it says "When he had said this, he breathed on them," etc. Concerning the first he does three things: first, he sets down the circumstances of the appearance; second, the substance of the appearance, where it says "Jesus came," etc.; third, the consequence of the appearance, where it says "the disciples were glad when they saw the Lord." He describes, then, the Lord's appearance to the disciples by four circumstances: first, from the description of the hour, since "when it was evening"; second, from the designation of the day, since "on that day"; third, from the condition of the place, since "when the doors were shut"; fourth, from the disposition of the disciples, since "they were gathered together for fear of the Jews." The hour of the appearance, then, was evening; of this there is a twofold literal reason. One, because he wished to appear to all at once; and therefore he waited until evening, so that those who had been scattered during the day might come together at evening, for at night they were together. The other reason is that the Lord appeared to them in order to comfort them. He therefore chose that hour in which, being more stupefied, they had greater need of comfort: and this is the evening. Psalm 45:2: "A helper in the tribulations that have found us exceedingly." There is also a mystical reason, namely that the Lord will appear to the faithful at the end of the world, when at midnight the cry will be made: "Behold, the bridegroom comes," about to render them their reward; Matthew 20:8: "When evening was come, the lord of the vineyard said to his steward: Call the laborers, and pay them their reward." The day of the appearance was the very day of the resurrection, since "on that day, the first of the sabbaths," that is, the Lord's day, of which it was said above (in this chapter), "now on the first day of the week." Why it is called "the first of the sabbaths" has already been said. It can be gathered from the Gospels that the Lord appeared five times on that day: twice to women, namely once to Mary Magdalene alone, of whom mention was made immediately above, and again together with the other women as they were returning; and then they came up and took hold of his feet. Third, he appeared to two disciples on that same day as they were going to Emmaus, Luke 24:13. Fourth, to Simon Peter; but when, and how, and where, is not expressed, except only that he appeared. Luke 24:34: "The Lord has truly risen, and has appeared to Simon." Fifth, he appeared to all of them gathered together at evening, as is related here. And therefore it is sung: "This is the day which the Lord has made: let us be glad and rejoice in it": Psalm 118:24. By this it is given to be understood that on the day of the common resurrection he will appear manifestly to all — to women, to sinners, to wayfarers, to apostles, and to apostolic men — for "every eye shall see him, and they also that pierced him": Apocalypse 1:7. The condition of the place, however, is described by its being shut up, a condition of doubt and fear, since "the doors were shut": literally, on account of the lateness of the hour, because it was night, and on account of fear of the Jews. But on Christ's part, the reason for the closed doors was that he might manifest to them the power of his might by entering to them while the doors were shut. It must be known concerning this, that according to some, to enter with the doors shut belongs to a property of a glorified body, which they say, by reason of a certain condition inherent in it, can be together with another body at once in the same place, insofar as it is glorified; and that this both took place and can take place without a miracle. But this cannot stand, because the fact that a non-glorified human body cannot be together with another body at once belongs to it from its nature. It is necessary, then, if a glorified body is said to have in itself some inherent property by which it can be together with another body in the same place, that there be excluded from it that property by which it is now prevented from being together with another. But this property is in no way separable or destructible from the body, since it is not, as they themselves say, a mathematical corporeality, but the very dimensions of the quantified body, to which position properly belongs as an accident. Whence the Philosopher argues against those who posit Ideas and separated matters. And that even granted that the whole space above the earth were void, a sensible body still could not be together with them, on account of the dimensions of quantity. But by no property of a glorified body could the dimensions be removed from the body, the nature of the body remaining. And therefore it must be said that Christ did this miraculously by the power of his divinity; and whenever something similar should occur in the saints, it would be miraculous, and comes about through a new miracle. And this Augustine and Gregory expressly say. For Augustine says: "You ask how he could enter through closed doors? If you comprehend the manner, it is not a miracle. Where reason fails, there is the edification of faith"; and he adds: "For he was indeed able to enter without their being opened, he at whose birth the virginity of his mother remained inviolate." Just as his birth from a virgin mother was miraculous by the power of his divinity, so was this entrance. Mystically, moreover, it is given to be understood by this that Christ appears to us when the doors — that is, the exterior senses — are shut in prayer, Matthew 6:6: "But when you pray, enter into your chamber"; and at the end of the world, when those who are ready will enter into the wedding feast, and afterward the door will be shut, as is related in Matthew 25:10. The disposition of the disciples is described as one to be imitated, since "they were gathered together"; which indeed is not without mystery. For Christ comes to those who are gathered together, the Holy Spirit descends upon those who are gathered together; because Christ and the Holy Spirit are present only to those gathered together in charity. Matthew 18:20: "Wherever two or three shall be gathered together in my name, there am I in the midst of them." Here the very appearance of Christ is set down as to three things: first, as to the presence of Christ which he displayed; second, as to the greeting which he offered them; third, as to the sure manifestation of himself, which he showed them. Now Christ displayed his presence to them without any doubt, for he "came and stood in the midst of the disciples." He came indeed personally, the very same one, just as he had promised them above, 14:28: "I go, and I come to you." But he "stood in the midst," so that all might recognize him with certainty. Whence the Jews are reproved, who did not recognize him. Above, 1:26: "But there has stood in your midst one whom you do not know." Again, he "stood in the midst" of the disciples, to show the conformity of the human nature which he has to them. Ecclesiasticus 50:13: "Round about him a crown of brethren, like a planting of cedar on Mount Lebanon." Again, he "stood in the midst" by condescension, since he conversed among them as one of them. Ecclesiasticus 32:1: "Have they made you ruler? Be not lifted up: be among them as one of themselves"; Luke 22:27: "But I am in the midst of you as he that serves." Again, to designate that we ought to be in the middle of virtue. Isaiah 30:21: "This is the way, walk in it, and turn not aside to the right hand nor to the left." For he who exceeds in excess turns aside to the right; but he who falls short by defect goes to the left. Now he uttered to them the words of greeting, saying "Peace be with you." But this was necessary, for their peace had been disturbed in many ways: both with regard to God, against whom some of them had sinned by denying him, some by fleeing — Matthew 26:31: "All you shall be scandalized in me this night; for it is written: I will strike the shepherd, and the sheep of the flock shall be scattered." And against this he set before them the peace of reconciliation with God; Romans 5:10: "We have been reconciled to God through the death of his Son"; for this he accomplished through his Passion. Again, with regard to themselves: for they were sorrowful, and doubtful in faith; and this peace too, now accomplished, he set before them. Psalm 118:165: "Much peace have they that love your law." Again, with regard to those outside: for they were suffering persecutions from the Jews; and against this he says to them "Peace be with you," namely against the persecutions of the Jews. Above, 14:27: "My peace I give to you, my peace I leave with you." Now he showed them the sure manifestation of himself through his hands and his side; whence it follows, "When he had said this, he showed them his hands and his side," because in these especially the signs of his Passion remained. Luke 24:39: "See my hands and my feet, that it is I myself." So too will he show himself in glory; above, chapter 14:23: "If anyone loves me, he will keep my word," and further on: "I will manifest myself to him." Here is set down the effect of the appearance, which is joy in the hearts of the disciples at the sight of the Lord — a joy which he had promised them above, chapter 16:22: "But I will see you again, and your heart shall rejoice." But this joy will be fulfilled in the homeland — that is, for the good — from the open vision of God. Isaiah 66:14: "You shall see, and your heart shall rejoice, and your bones shall flourish like an herb." He enjoins upon the apostles their office, and first he prefaces it with the bond of peace; second, he enjoins the office, where it says "As the Father has sent me." He said to them, therefore, again, "Peace be with you." He said this to them against a twofold disturbance: for against the present disturbance from the Jews, he first said to them "Peace be with you"; but against the disturbance to be caused by the Gentiles, he said to them again, "Peace be with you." Above, 16:33: "In the world you shall have distress, but in me, peace." For they were to be sent to the Gentiles. And therefore the enjoining of the office is immediately added: "As the Father has sent me, I also send you," in which he shows himself the mediator between God and men. 1 Timothy 2:5: "The mediator of God and men, the man Christ Jesus," etc. This was for the consolation of the disciples, who, recognizing the authority of Christ, knew that he sent them by divine authority. Again, considering their own dignity, namely that they had the proper office of apostles: for "apostle" is the same as "one sent." He says, then, "As the Father has sent me, I also send you" — that is, as the Father, loving me, sent me into the world to endure the Passion for the salvation of the faithful (above, 3:17: "For God did not send his Son into the world to judge the world, but that the world might be saved through him"), so I, loving you, send you to sustain tribulations for my name's sake. Matthew 10:16: "Behold, I send you as sheep in the midst of wolves." Second, fitness for the office is given to them through the gift of the Holy Spirit. 2 Corinthians 3:6: "Who also has made us fit ministers of the new testament, not in the letter but in the spirit." Whence it follows, "When he had said this, he breathed on them," etc. And concerning this gift, he first prefaces the sign of the gift, which is the breathing upon them; whence he says "he breathed on them." Something similar is found in Genesis 2:7: "He breathed into his face the breath of life" — which the first man corrupted, namely the breath of natural life; but this Christ restored, by giving the Holy Spirit. It is not to be understood that this breath of Christ was the Holy Spirit himself, but a sign of him. Whence Augustine says in Book IV of On the Trinity: "That bodily breath was not the substance of the Holy Spirit, but a demonstration, through a fitting signification, that the Holy Spirit proceeds not only from the Father but also from the Son." It must be noted, however, that upon Christ the Holy Spirit was sent, first, in the form of a dove at the Baptism (above, chapter 3), and in the form of a cloud at the Transfiguration; Matthew 17:5. The reason for this is that the grace of Christ, which is given through the Holy Spirit, had to be derived to us through the propagation of grace in the sacraments; and thus he descended in the form of a dove at the Baptism, which is a fecund animal; and through teaching, and thus he descended in a shining cloud. Whence there too the teacher is pointed out; whence it says, "Hear him." But upon the apostles he first descended in a breath, to designate the propagation of grace in the sacraments, of which they themselves were ministers; whence he says, "Whose sins you shall forgive, they are forgiven them." Matthew 28:19: "Going therefore, baptize them in the name of the Father, and of the Son, and of the Holy Spirit." Second, however, in fiery tongues, to signify the propagation of grace through teaching. Whence Acts 2:4 says that after they were filled with the Holy Spirit, they immediately began to speak. Second, he sets down the words of the giving, saying, "Receive the Holy Spirit." But did they indeed receive the Holy Spirit here? It seems not, because since he had not yet ascended on high, he ought not to have given gifts to men. And indeed, according to Chrysostom, some say that Christ did not here give them the Holy Spirit, but prepared them for the future giving at Pentecost. And they are moved to this because it is said in Daniel 10:8 that he could not sustain the vision of the angel; whence these men, unless prepared, could not have sustained the coming of the Holy Spirit. But nevertheless Chrysostom himself says: the Holy Spirit was given to the disciples not generally for all things, but for a certain effect, namely for the forgiving of sins, as also, per Matthew 10:8, for the working of miracles. But Augustine and Gregory say that the Holy Spirit has two precepts of love, namely of God and of neighbor; and therefore he was first given on earth, to designate the precept of love of neighbor; second, from heaven, to designate the precept of love of God. Third, the fruit of the giving is set down: "Whose sins you shall forgive, they are forgiven them" — which is a fitting effect of the Holy Spirit, namely the remission of sins; for he himself is charity, and through him charity is given to us. Romans 5:5: "The charity of God is poured forth in our hearts through the Holy Spirit, who has been given to us." But the remission of sins does not take place except through charity. For "charity covers all offenses"; 1 Peter 4:8: "Charity covers a multitude of sins." Here, then, a question is first raised concerning what he says, "Whose sins you shall forgive," since God alone forgives sins. To this some say that God alone forgives the guilt, but the priest absolves only from the liability to punishment, and declares him absolved from the stain of guilt. But this is not true; for the sacrament of penance, since it is a sacrament of the new law, confers grace, just as it is conferred in Baptism. But in Baptism the priest baptizes instrumentally, and yet grace is conferred: therefore likewise in the sacrament of penance he absolves sacramentally and ministerially from punishment and guilt, insofar as he administers the sacrament in which sins are forgiven. But as for what is said, that God alone forgives sins, this is true with respect to authority. Thus also God alone baptizes; but the priest baptizes ministerially, as has been said. Again, a question is raised concerning what he says, "Receive the Holy Spirit: whose sins you shall forgive, they are forgiven them." It seems, then, that whoever does not have the Holy Spirit cannot forgive sins. To this it must be said that if the remission of sins were the proper work of the priest — that is, if he did this by his own power — then indeed none but a holy man could sanctify. But the remission of sins is the proper work of God, who forgives sins by his own power and authority; whereas it belongs to the priest only as to an instrument. Just as, therefore, a master can, through his servant and minister, whether he be good or bad, accomplish his will in the carrying out of certain things, so too the Lord, through ministers, even if they be evil, can confer the sacraments, in which grace is given. Again, a question is raised concerning what is said, "Whose sins you shall forgive, they are forgiven them." To this it must be said that, as has been said, the priest acts in the sacraments as the minister of God. 1 Corinthians 4:1: "Let a man so account of us, as of the ministers of Christ, and the dispensers of the mysteries of God." In the same manner, then, in which God forgives and retains sins, so too does the priest. Now God forgives sins by bestowing grace; but he is said to retain them by not bestowing it, on account of an impediment on the part of the recipient. So too the minister forgives sins insofar as he bestows the sacrament of the Church; and he retains them insofar as he shows some to be unworthy of the reception of the sacraments.”

Reformation

c. 1500 – 1650
1637
A.D.
1567–1637
“Then said Jesus to them again , Peace be unto you. Why again ? The Interlinear Gloss says, “ It was a repeated confirmation, Peace upon peace, according to the prophet.” Bede says, “ He repeats it, because the virtue of charity is twofold, or because He is the peace who makes both one.” The Gloss, “He offers peace, who came for the sake of peace; and He repeats His words to show that all things whether in heaven or in earth are restored to peace through Him.” S. Chrysostom, “ Because they were waging an unappeasable contest with the Jews.” He proclaims peace in order to console them, and sets forth also the power of the cross, by which He drave away all sorrow, and conferred every good, which is peace. But a further joy was announced to the women, for they had to bear the curse, “ in sorrow shalt thou bring forth,” and they were indeed in sorrow. As My Father hath sent Me , even so send I you. With like power, authority, end, mode, and love. Observe here by this word ‘as’ Christ in a manner puts His Apostles on an equality with Himself, that is proportionately, as His successors and vicars. This word signifies likeness in office ; with the same power and special authority with which the Father sent Me to found His Church, do I send you as its teachers and rulers (as I am Myself), that ye may have power to remit sin, as I also have. So Rupertus, S. Cyril, Theophylact, who maintain that by these words Digitized by v^iOOQLe 270 Christ made His Apostles His Vicars, the teachers and pastors of the world, and communicated to them His own office and authority, that is to say, all ecclesiastical authority, in fact made them Bishops. But Turrianus thinks that they were created Bishops on the day of Pentecost, as he writes in his notes on the Apostolic Constitution, vi. n. Bellarmine (de Rom. Pontiff i. 24), following Turrecremata, thinks that only S. Peter was ordained Bishop by our Lord, and that the other Apostles were ordained by S. Peter. Suarez considers it more probable that all the Apostles were ordained Bishops by Christ, though not certain as to time and place (see Tract de Fidey Disput. v. sect 1 num. 8). S. Augustine takes this latter view (Quasi, xcviii. in Quast. N. and Vet. Test.) (2.) The word ‘as1 signifies similarity of origin. The beginning of Christ’s mission, as also that of the Apostles, was God Himself. (3.) It signifies likeness of object or end, that is, the propagation of the faith and the salvation of the world. So S. Cyril and Leontius. (4.) Likeness of mode, that ye may confirm your teaching by miracles, as I have confirmed Mine. (5.) Likeness of mutual love. As the Father sent Me to shed My blood from love of Him, with the same love do I send you. For it is a mark of the supreme love of God when He makes any one his witness and martyr. Hear S. Gregory. “ In sending you forth among the perils of persecutors, I love you with the same love that the Father had to Me, when He sent Me to endure My Passion.””
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Then said Jesus to them again,.... The words he said before: peace be unto you; which he repeated, to put them out of their fright, by reason of which they returned him no answer; and to raise and engage their attention to what he was about to say; and to pacify their consciences, distressed with a sense of their conduct towards him; and with a view to the Gospel of peace, he was now going to send them to preach: as my Father hath sent me, even so send I you; Christ's mission of his disciples, supposes power in him, honour done to them, authority put upon them, qualifications given them, and hence success attended them; what they were sent to do, was to preach the Gospel, convert sinners, build up saints, plant churches, and administer ordinances. The pattern of their mission, is the mission of Christ by his Father, which was into this world, to do his will, preach the Gospel, work miracles, and obtain eternal redemption for his people; and which mission does not suppose inferiority in his divine person, nor change of place, but harmony and agreement between the Father and Son: the likeness of these missions lies in these things; their authority is both divine; they are both sent into the same place, the world; and in much the same condition, mean, despicable, hated and persecuted; and in part for the same end, to preach the Gospel, and work miracles, for the confirmation of it; but not to obtain redemption, that being a work done solely by Christ; in which he has no partner, and to whom the glory must be only ascribed.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Even so send I you - As I was sent to proclaim the truth of the Most High, and to convert sinners to God, I send you for the very same purpose, clothed with the very same authority, and influenced by the very same Spirit.”
1849
A.D.
1774–1849
“As the Father hath sent me. The word mission, when applied to our Saviour Christ, sometimes signifies his eternal procession from the Father, and sometimes his mission, as he was sent into the world to become man, and the Redeemer of mankind: the first mission agrees with him, as the eternal Son of God; the second, as man, or as both God and man. The mission which Christ here gives his apostles, is like this latter mission, with this great difference, that graces and divine gifts were bestowed on Christ, even as man, without measure: and the apostles had a much lesser share in both these missions. See St. Augustine, lib. iv. de Trin. chap. xix. xx. tom. 4. p. 829. and seq. (Witham) — Jesus Christ here shews his commission, and so giveth power to his apostles to forgive sins, as when he gave them commission to preach and baptize throughout the world, he made mention of his own power. Hence, whosoever denies the apostles, and their successors, the right of preaching, baptizing, and remitting sins, must consequently deny that Christ, as man, had the power to do the same. St. Cyprian, in the 3rd century, ep. lxxiii. says: “for the Lord, in the first place, gave to St. Peter, on whom he built his Church, super quem ædificavit Ecclesiam, the power that what he loosed on earth, should be loosed also in heaven. And after his resurrection, he speaks also to his apostles, saying, as the Father sent me, &c. whose sins you shall forgive,” &c. Why, on this occasion, passing over the other apostles, does Jesus Christ address Peter alone? Because he was the mouth, and chief of the apostles. (St. Chrysostom, de Sacerd. lib. ii. chap. 1.)”
Source
1871
A.D.
1871
“Then said Jesus--prepared now to listen to Him in a new character. Peace be unto you. As my Father hath sent me, so send I you--(See on Joh 17:18).”
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.