The Apostle Paul
Romans 16:19ESV·traditional attribution

For your obedience is known to all, so that I rejoice over you, but I want you to be wise as to what is good and innocent as to what is evil.

John Calvin Reformed @genevareformer

19. Your obedience, This he calls “faith” in Romans 1:8: so that obedience to the gospel is faith in what it declares. To believe is the special command of the gospel: hence to believe is the special act of obedience that is required; and he who believes is he who shall be saved.

Matthew Henry Presbyterian @wholebiblehenry

The apostle having endeavoured by his endearing salutations to unite them together, it was not improper to subjoin a caution to take heed of those whose principles and practices were destructive to Christian love. And we may observe, I. The caution itself, which is given in the most obliging manner that could be: I beseech you, brethren.

Commenting on Romans 16:17-20

John Gill Reformed Baptist @doctorgill

And the God of peace,.... See Gill on Rom 15:33; shall bruise Satan under your feet shortly. Some read this by way of wish or prayer, "may the God of peace bruise"; so the Vulgate Latin, Syriac, and Ethiopic versions, and the Alexandrian copy; but others as ours, as a promise, or as expressive of the apostle's faith and hope in this matter; and which...