| Barnes' Notes on the Bible For I rejoiced greatly when the brethren came - Who these were is not certainly known. They may have been members of the same church with Gaius, who, for some reason, had visited the writer of this Epistle; or they may have been the "brethren" who had gone from him with a letter of commendation to the church, 3 John 1:9, and had been rejected by the church through the influence of Diotrephes, and who, after having been hospitably entertained by Gaius, had again returned to the writer of this Epistle. In that case, they would of course bear honorable testimony to the kindness which they had received from Gaius, and to his Christian character. And testified of the truth that is in thee - That you adhere steadfastly to the truth, notwithstanding the fact that errors abound, and that there are many false teachers in the world. Even as thou walkest in the truth - Livest in accordance with the truth. The writer had made the same remark of the children of Cyria, to whom the second Epistle was directed. See the notes at 2 John 1:4.
Clarke's Commentary on the BibleWhen the brethren came - Probably the same of whom he speaks in the fifth (3 John 1:5) and following verses, and who appear to have been itinerant evangelists. The truth that is in thee - The soundness of thy faith and the depth of thy religion.
Gill's Exposition of the Entire BibleFor I rejoiced greatly when the brethren came,.... From the place where Gaius lived, to that where John now resided; these brethren seem to be preachers of the word, who travelled from place to place to spread the Gospel: and testified of the truth that is in thee; either of Christ, who was formed in him; or of the Gospel, which had a place in his heart; or of the truth of grace that was in him, as well as of that faithfulness, integrity, and sincerity he appeared to be possessed of, being an Israelite indeed, and without guile: even as thou walkest in the truth: in Christ, and in the Gospel, and as became it, and with all uprightness; see 2 John 1:4; and this occasioned great joy in the apostle; as it is matter of joy to every one that truly loves Christ, and his Gospel; or has the true grace of charity in him, which envies not the gifts and graces of others, but rejoiceth in the truth, wherever it is found; and especially to the faithful ministers of the word, when they hear of the truth of grace in any souls, and that such continue walking in the truth of the Gospel, and particularly those who have been wrought upon under their ministry, as follows.
Vincent's Word StudiesRejoiced greatly See on 2 John 1:4. Brethren came (ἐρχομένων ἀδελφῶν) Lit., coming. The present participle denotes coming from time to time, and not coming on a single occasion, which would require the aorist. On brethren, see on 1 John 2:9. Thou walkest in truth See on 1 John 1:8. for the phrase walk in, see on 2 John 1:6. Thou is emphatic, suggesting a contrast with less faithful ones, as Diotrephes, 3 John 1:9.
Geneva Study BibleFor I rejoiced greatly, when the brethren came and testified of the truth that is in thee, even as thou walkest in the truth.
People's New Testament 1:3 For I rejoiced greatly. Certain brethren had been where Gaius lived, had enjoyed his hospitality and had spoken well of him to John on their return.
Wesley's Notes 1:3 For - I know thou usest all thy talents to his glory. The truth that is in thee - The true faith and love.
Jamieson-Fausset-Brown Bible Commentary3. testified of the truth that is in thee-Greek, "of" (or 'to') thy truth": thy share of that truth in which thou walkest [Alford]. even as thou-in contrast to Diotrephes (3Jo 9).
Matthew Henry's Concise Commentary1:1-8 Those who are beloved of Christ, will love the brethren for his sake. Soul prosperity is the greatest blessing on this side heaven. Grace and health are rich companions. Grace will employ health. A rich soul may be lodged in a weak body; and grace must then be exercised in submitting to such a dispensation. But we may wish and pray that those who have prosperous souls, may have healthful bodies; that their grace may shine where there is still more room for activity. How many professors there are, about whom the apostle's words must be reversed, and we must earnestly wish and pray that their souls might prosper, as their health and circumstances do! True faith will work by love. A good report is due from those who receive good; they could not but testify to the church, what they found and felt. Good men will rejoice in the soul prosperity of others; and they are glad to hear of the grace and goodness of others. And as it is a joy to good parents, it will be a joy to good ministers, to see their people adorn their profession. Gaius overlooked petty differences among serious Christians, and freely helped all who bore the image, and did the work of Christ. He was upright in what he did, as a faithful servant. Faithful souls can hear their own praises without being puffed up; the commendation of what is good in them, lays them at the foot of the cross of Christ. Christians should consider not only what they must do, but what they may do; and should do even the common actions of life, and of good-will, after a godly sort, serving God therein, and designing his glory. Those who freely make known Christ's gospel, should be helped by others to whom God gives the means. Those who cannot themselves proclaim it, may yet receive, help, and countenance those who do so.
Matthew Henry's Whole Bible CommentaryVerses 3-8 In these verses we have, I. The good report that the apostle had received concerning this friend of his: The brethren came and testified of the truth that is in thee (v. 3), who have borne witness of thy charity before the church, v. 6. Here we may see, 1. The testimony or thing testified concerning Gaius-the truth that was in him, the reality of his faith, the sincerity of his religion, and his devotedness to God; and this evinced by his charity, which includes his love to the brethren, kindness to the poor, hospitality to Christian strangers, and readiness to accommodate them for the service of the gospel. Faith should work by love; it gives a lustre in and by the offices of love, and induces others to commend its integrity. 2. The witnesses-brethren that came from Gaius testified and bore witness. A good report is due from those who have received good; though a good name is but a small reward for costly service, yet it is better than precious ointment, and will not be refused by the ingenuous and religious. 3. The auditory or judicatory before which the report and testimony were given-before the church. This seems to be the church at which the apostle now resided. What church this was we are not sure; what occasion they had thus to testify his faith and love before the church we cannot tell; possibly out of the fulness of the heart the mouth spoke; they could not but testify what they found and felt; possibly they would engage the church's prayer for the continued life and usefulness of such a patron, that he might prosper and be in health as his soul prospered. II. The report the apostle himself gives of him, introduced by an endearing appellation again: Beloved, thou doest faithfully whatsoever thou doest to the brethren, and to strangers, v. 5. 1. He was hospitable, good to the brethren, even to strangers; it was enough to recommend them to Gaius's house that they belonged to Christ. Or he was good to the brethren of the same church with himself, and to those who came from far; all who were of the household of faith were welcome to him. 2. He seems to have been of a catholic spirit; he could overlook the petty differences among serious Christians, and be communicative to all who bore the image and did the work of Christ. And, 3. He was conscientious in what he did: "Thou doest faithfully (thou makest faithful work of) whatsoever thou doest; thou doest it as a faithful servant, and from the Lord Christ mayest thou expect the reward of the inheritance." Such faithful souls can hear their own praises without being puffed up; the commendation of what is good in us is designed, not for our pride, but for our encouragement to continue therein, and should be accordingly improved. III. The apostle's joy therein, in the good report itself, and the good ground of it: I rejoiced greatly when the brethren came and testified, etc., v. 3. I have no greater joy than to hear that my children walk in the truth, in the prescripts of the Christian religion. The best evidence of our having the truth is our walking in the truth. Good men will greatly rejoice in the soul-prosperity of others; and they are glad to hear of the grace and goodness of others. They glorified God in me. Love envieth not, but rejoiceth in the good name of other folks. As it is joy to good parents, it will be joy to good ministers, to see their children evidence their sincerity in religion, and adorn their profession. IV. The direction the apostle gives his friend concerning further treatment of the brethren that were with him: Whom if thou bring forward on their journey, after a godly sort, thou shalt do well. It seems to have been customary in those days of love to attend travelling ministers and Christians, at least some part of their road, 1 Co. 16:6. It is a kindness to a stranger to be guided in his way, and a pleasure to travellers to meet with suitable company: this is a work that may be done after a godly sort, in a manner worthy of God, or suitable to the deference and relation we bear to God. Christians should consider not only what they must do, but what they may do, what they may most honourably and laudably do: the liberal mind deviseth liberal generous things. Christians should do even the common actions of life and of good-will after a godly sort, as serving God therein, and designing his glory. V. The reasons of this directed conduct; these are two:-1. Because that for his name's sake these brethren went forth, taking nothing of the Gentiles. It appears thus that these were ministerial brethren, that they went forth to preach the gospel and propagate Christianity; possibly they might be sent out by this apostle himself: they went forth to convert the Gentiles; this was excellent service: they went forth for God and his name's sake; this is the minister's highest end, and should be his principal spring and motive, to gather and to build up a people for his name: they went forth also to carry a free gospel about with them, to publish it without charge wherever they came: Taking nothing of the Gentiles. These were worthy of double honour. There are those who are not called to preach the gospel themselves who may yet contribute to the progress of it. The gospel should be made without charge to those to whom it is first preached. Those who know it not cannot be expected to value it; churches and Christian patriots ought to concur to support the propagation of holy religion in the pagan countries; public spirits should concur according to their several capacities; those who are freely communicative of Christ's gospel should be assisted by those who are communicative of their purses. 2. We ought therefore to receive such, that we may be fellow-helpers to the truth, to true religion. The institution of Christ is the true religion; it has been attested by God. Those that are true in it and true to it will earnestly desire, and pray for, and contribute to, its propagation in the world. In many ways may the truth be befriended and assisted; those who cannot themselves proclaim it may yet receive, accompany, help, and countenance those who do. | 
