Be watchful, stand firm in the faith, act like men, be strong.
13. Watch ye. A short exhortation, but of great weight. He exhorts them to watch, in order that Satan may not oppress them, finding them off their guard. For as the warfare is incessant, the watching requires to be incessant too. Now watchfulness of spirit is this — when, free and disentangled from earthly cares, we meditate on the things of God.
In this passage the apostle gives, I. Some general advices; as, 1. That they should watch (Co1 16:13), be wakeful and upon their guard. A Christian is always in danger, and therefore should ever be on the watch; but the danger is greater at some times and under some circumstances.
Commenting on 1 Corinthians 16:13-18
Let all your things be done with charity. Signifying, that the whole of their obedience to Christ, their observation of, and subjection to all his ordinances and commands, should spring from, and be done in love to him; and that the whole of their conduct and behaviour towards one another ought to be with charity, which bears all things, and covers a multitude of sins...