The interpretation timeline
2 Corinthians 8:23 Douay-Rheims

Either for Titus, who is my companion and fellow labourer towards you, or our brethren, the apostles of the churches, the glory of Christ.

A.D. 407 – 1871 5 witnesses

Patristic

before A.D. 750
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“And then, after having showed forth their virtue, he exhorts them also on their behalf, saying, "Whether any inquire about Titus; he is my partner and my fellow-worker to youward." What is, "Whether about Titus?" 'If,' says he, 'it be necessary to say any thing, this I have to say,' "that he is my partner and fellow-worker to youward." For he either means this; or, 'if ye will do anything for Titus, ye will do it unto no ordinary person, for he is "my partner."' And whilst appearing to be praising him, he magnifies them, showing them to be so disposed towards himself as that it were sufficient ground of honor amongst them that any one should appear to be his "partner." But, nevertheless, he was not content with this, but he also added another thing, saying, "fellow-worker to youward." Not merely "fellow-worker," 'but in matters concerning you, in your progress, in your growth, in our friendship, in our zeal for you;' which last would avail most especially to endear him unto them. "Or our brethren:" 'or whether you wish,' he says, 'to hear any thing about the others: they too have great claims to be commended to you. For they also,' he saith, 'are our brethren, and, "The messengers of the Churches,"' that is, sent by the Churches. Then, which is greater than all, "The glory of Christ;" for to Him is referred whatever shall be done to them. 'Whether then ye wish to receive them as brethren, or as Apostles of the Churches, or as acting for the glory of Christ; ye have many motives for good will towards them. For on behalf of Titus, I have to say, that he is both "my partner," and a lover of you; on behalf of these, that they are "brethren," that they are "the messengers of the churches," that they are "the glory of Christ." Seest thou that it is plain from hence also, that they were of such as were unknown to them? For otherwise he would have set them off by those things with which he had also set off Titus, namely, his love towards them. But whereas as yet they were not known to them, 'Receive them,' he says, 'as brethren, as messengers of the churches, as acting for the glory of Christ.'”
Source

Scholastic

c. 1100 – 1500
1272
A.D.
Thomas Aquinas Catholic
1225–1274
“After he has treated of the giving of the collections, here he consequently treats of the ministers through whom the collections are made. And concerning this he does two things. First he names them; second he commends them to the Corinthians, at "the showing therefore which is," etc. Concerning the first he does three things. For first he names Titus; second Barnabas, at "we have also sent with him the brother," etc.; third Apollo, at "we have sent with them," etc. Concerning Titus he commends two things, namely his solicitude and the sign of his solicitude, at "for indeed the exhortation," etc. He says therefore first: I have said, above, that I asked Titus to complete this grace concerning the gathering of alms, which is incumbent upon my solicitude by the ordination of the apostles, in which matter I also found him solicitous; and therefore I give thanks to God, who gave the same solicitude, which I have, for you, to be exhorted and advanced to works of mercy, in the heart of Titus; because he too is solicitous, just as I am, that he may complete this grace in you. Heb. 6:11: we desire each one of you to show the same solicitude, etc. Rom. 12:8: he who presides, in solicitude. Now the sign of this solicitude is that when I asked him, he himself consented to my exhortation. And therefore he says: for indeed he received the exhortation. And because he pursued what I asked, whence he says: but since he was more solicitous by his own will than by my exhortation, he set out to you; who nevertheless at first refused to come on account of your sins. Rom. 12:11: in solicitude, not slothful. Consequently, when he says "but we have sent," etc., he treats of the second minister. And concerning this he does two things. First he commends him; second he adds the reason why he sends such solemn messengers, at "avoiding," etc. This brother, according to some, is Luke, or according to others Barnabas, whom indeed he commends from three things: from fame, because his praise, namely Luke's, is in the Gospel written by him throughout all the Churches, because it has been approved by the apostles. Or whose praise, namely Barnabas's, is in the Gospel preached by him throughout all the Churches, because to the Jews and to the Gentiles. Whence it is said of Barnabas, Acts 11:24, that he was a good man, full of faith and the Holy Spirit. Likewise he commends him from his companionship, because he is not only famous, but has also been appointed by the Churches of Judea as a companion of my pilgrimage, that is, of my preaching, by which, as pilgrims, we go about the world. Above ch. 5:6: as long as we are in the body, we are pilgrims from God, etc. And this is true of Luke, because he was one of the seventy-two disciples, and a companion of Paul. Of Barnabas likewise, because through the Holy Spirit it is said, Acts 13:2: separate for me Barnabas and Paul unto the work, etc. And he was made a companion in this grace, namely of the collection of alms. Or in this grace, namely of preaching, of which it is said Eph. 3:8: but to me, the least of all the saints, etc. Likewise he commends him from office, because he is a minister of the grace which is ministered by us. 1 Cor. 4:1: so let a man esteem us. Above ch. 3:6: who also has made us fit, etc. Now this grace is ministered unto the glory of the Lord, that is, that our Lord may be glorified, namely from the alms given, from the conversion of very many peoples to our preaching, because, as it is said Prov. 14:28, in the multitude of the people, etc. Likewise it is ministered, that our will may be fulfilled, because we wish this to be done. And therefore he says: and our will, destined — that is, predestined by God, who predestined from eternity that we should have such a will. Consequently, when he says "avoiding," etc., he assigns the cause why he sends such solemn messengers. And first he assigns the reason for this; second he proves it, at "we provide therefore," etc. He says therefore: the reason why we send such solemn messengers is this: that you may know that a business of this kind is present to our heart. And therefore he says "avoiding this," namely lest anyone, etc., as if to say: that we might avoid the reproach which could be cast upon me by some, either of negligence, if I did not send diligent men, or of fraud, if I did not send trustworthy ones. And these were diligent and ready and trustworthy, because they were given by the Churches and chosen through the Holy Spirit. Above ch. 6:3: giving no offense to anyone, etc. Now he says "in this abundance," namely of alms or of the conversion of the Gentiles. 1 Pet. 4:10: each one, as he has received grace, unto one another, etc. And he proves this, saying "for we provide," etc., as if to say: I rightly say "avoiding," because we provide — that is, we ought to provide — good things, that is, that our works may be good not only before God, that we may please him, but also before men, that is, that they may appear good to them. And this he does, by carefully procuring and imitating the good. Rom. 12:9: cleaving to the good, etc. Consequently, when he says "but we have sent with them our brother also," etc., he treats of the third messenger, namely of Apollo. Where he does two things. First, he commends him for his solicitude, when he says "whom," namely Apollo, "we have often proved to be solicitous for your salvation; but now much more solicitous." For, as appears above, Apollo was the first who preached at Corinth after the apostle. 1 Cor. 3:6: I planted, Apollo watered. But this man, disturbed by their sin, withdrew, and set aside the solicitude which he had before had for them. But now, having heard of their conversion, he became more solicitous for their salvation than he had been before. Eph. 4:3: solicitous to keep the unity of the spirit, etc. Rom. 12:8: he who presides, in solicitude, etc. Second, he adds the cause of the solicitude which he took up, because Apollo trusted concerning you from those things which Titus said about you, commending you. Whence he says "with much confidence in you," whether on account of Titus who is my companion, and because he willingly came into the fellowship of Titus and Luke or Barnabas, and because he was induced to this by the apostles of the Churches which are in Judea. And therefore he says "or our brethren," the apostles of the Churches of Judea, namely they induced him to have solicitude for you. Which Churches indeed are "of the glory of Christ," that is, unto the glory of Christ. Consequently, when he says "the showing therefore which is," etc., he commends these messengers to the Corinthians, saying: because we have sent such men to you, therefore "the showing," etc., that is, show by deed, that you have charity toward them, and that I have truly commended you, and that I have truly gloried concerning you in the face of the Churches, to which I have come and to which I have preached. Or "in the face of all the Churches," because what you do to them will become known to all the Churches.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Wherefore show ye to them, and before the churches,.... This is the conclusion of the apostle, upon summing up the characters of these messengers; and his exhortation is, that since they were persons of so much note and worth, as they ought to be received with great marks of respect and affection, so they would take care evidently to make it appear to them who were sent by the churches, and before the churches, or before them who represented the churches; or so as that it might be known by the churches from whence they came, when they returned with their report; or be evident to the churches in Judea, when their liberality should be brought to them: the proof of your love; to Christ and his poor members, how hearty and sincere it was: and of our boasting on your behalf; how willing and forward they were to this good work, and how liberal they would be. Next: 2 Corinthians Chapter 9”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Whether any do inquire of Titus - Should it be asked, Who is this Titus? I answer, he is my companion, and my fellow laborer in reference to you; Co2 2:13; Co2 7:6, Co2 7:7. Should any inquire, Who are these brethren, Luke and Apollos? I answer, They are Αποστολοι, apostles of the Churches, and intensely bent on promoting the glory of Christ.”
Source
1871
A.D.
1871
“fellow helper concerning you--Greek, "fellow worker towards you." our brethren--the two mentioned in Co2 8:18, Co2 8:22. messengers--rather, as the Greek, "apostles": in the less strict sense (Act 14:14). of the churches--sent by the churches, as we are by the Lord (Phi 2:25). There was in the synagogue an ecclesiastical officer, called "the angel of the Church," whence the title seems derived (compare Rev 2:1).”
Source
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.