Matthew Poole and continuators on 2 Corinthians 8:23

23 Whether any do inquire of Titus, he is my partner and fellow-helper concerning you: or our brethren be inquired of, they are the messengers of the churches , and the glory of Christ .

This Verse contains the Apostles credential Letters, given to Titus, and the other two persons, sent about the business of making this Collection in the Church of Corinth. Many, in matters where the drawing of their purses is sollicited and concerned, are very scrupulous and inquisitive, seeking all advantages to excuse themselves; one while pleading their own poverty, another while objecting against the state, or want, or quality of those for whom they are sollicited; again, questioning, whether their Charity shall ever come to those persons for whom it is desired, objecting against the persons intrusted with the conveyance or distribution of it. The Apostle having therefore before obviated some Objections, he here obviateth the last mentioned, letting them know, that the persons intrusted with this Service, were unexceptionable persons. He calleth Titus his Partner and Fellow-helper concerning them, that is, in the business of the Gospel, and promoting the Salvation of their Souls. For the others, he tells them they were such as the Churches had thought fit to make their Messengers; so had the credit of the Churches, whose Messengers they were, who would not have intrusted them, if they had not judged them faithful.

He either calleth the Churches, or them, the Glory of Christ. If the words be to be understood of the Messengers, (which seemeth the fairest application of them) the meaning is, that they were Instruments of the glory of Christ; or persons who, by their Grace, did bring much glory to Christ. Every one that excelleth in the habits or exercise of Grace, is the glory of Christ, because without Christ he can do nothing of that nature: I live, yet not I, but Christ liveth in me. The acts and exercises of Grace are indeed our acts, but the power by which we do them, is from Christ; we glory in Christ, and by our holy conversations glorifie Christ, and Christ glorieth in every pious and holy person, as God did concerning Iob, Chap. 1.8. & 2.3.