16:13-18 A Christian is always in danger, therefore should ever be on the watch. He should be fixed in the faith of the gospel, and never desert or give it up. By this faith alone he will be able to keep his ground in an hour of temptation. Christians should be careful that charity not only reigns in their hearts, but shines in their lives. There is a great difference between Christian firmness and feverish warmth and transport. The apostle gave particular directions as to some who served the cause of Christ among them. Those who serve the saints, those who desire the honour of the churches, and to remove reproaches from them, are to be thought much of, and loved. They should willingly acknowledge the worth of such, and all who laboured with or helped the apostle.

18. refreshed my spirit and yours—"yours" will be refreshed on receiving this letter, by knowing that "my spirit is refreshed" by their having come to me from you; and (perhaps) by the good report they gave of many of you (1Co 1:4-8); my refreshment of spirit redounds to yours, as being my disciples (2Co 7:13; compare Zec 6:8).

acknowledge—render them due acknowledgments by a kind reception of them: 1Th 5:12, "know" them in their true worth and treat them accordingly.