Watch ye, stand fast in the faith, quit you like men, be strong.

People's New Testament

16:13 Watch ye. Be on the watch; a matter very needful in as gay and corrupt a city as Corinth.

Wesley's Notes

16:13 To conclude. Watch ye - Against all your seen and unseen enemies. Stand fast in the faith - Seeing and trusting him that is invisible. Acquit yourselves like men - With courage and patience. Be strong - To do and suffer all his will.

Jamieson-Fausset-Brown Bible Commentary

13. He shows that they ought to make their hopes of salvation to depend not on Apollos or any other teacher; that it rests with themselves. "Watch ye": for ye are slumbering. "Stand": for ye are like men tottering. "Quit you like men; be strong": for ye are effeminate (1Co 16:14). "Let all your things be done with charity" (1Co 8:1; 13:1): not with strifes as at present [Chrysostom]. "In the faith" which was assailed by some (1Co 15:1, 2, 12-17).

Matthew Henry's Concise Commentary

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.