John Calvin Reformed @genevareformer

15. The more boldly, however, have I written to you, etc. The excuse follows, and in adducing this, that he might more fully show his modesty, he says, by way of concession, that he acted boldly in interposing in a matter which they themselves were able to do; but he adds that he was led to be thus bold on account of his office, because...

Matthew Henry Presbyterian @wholebiblehenry

Here, I. He commends these Christians with the highest characters that could be. He began his epistle with their praises (Rom 1:8), Your faith is spoken of throughout the world, thereby to make way for his discourse: and, because sometimes he had reproved them sharply, he now concludes with the like commendation, to qualify them, and to part friends. This he does like an orator.

Commenting on Romans 15:14-16

John Gill Reformed Baptist @doctorgill

That I should be the minister of Jesus Christ,.... The office of apostleship is here amplified and enlarged on, and the ends shown for which that grace was given to him, that he should be a minister; not in holy things about the temple, as the priests and Levites were; or a teacher of the law, some were fond of; but a minister of Christ...