When 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.
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.
For ye were sometimes darkness, but now are ye light in the Lord: walk as children of light. Ephesians 5:8. SD 200.1
“Walk in the light.” To walk in the light means to resolve, to exercise thought, to exert will-power, in an earnest endeavor to represent Christ in sweetness of character. It means to put away all gloom. You are not to rest satisfied simply in saying, “I am a child of God.” Are you beholding Jesus, and, by beholding, becoming changed into His likeness? To walk in the light means advancement and progress in spiritual attainments. Paul declared, “Not as though I had already attained, either were already perfect; but ... forgetting those things which are behind,” constantly beholding the Pattern, I reach “forth unto those things which are before.” To walk in the light means to “walk uprightly,” to walk “in the way of the Lord,” to “walk by faith,” to “walk in the Spirit,” to “walk in the truth,” to “walk in love,” to “walk in the newness of life.” It is “perfecting holiness in the fear of God.” SD 200.2
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