The Apostle Paul
Philemon 1:16BSB·traditional attribution

no longer as a slave, but better than a slave, as a beloved brother. He is especially beloved to me, but even more so to you, both in person and in the Lord.

John Calvin Reformed @genevareformer

But above a servant, a beloved brother. He next brings forward another advantage of the flight, that Onesimus has not only been corrected by means of it, so as to become a useful slave, but that he has become the “brother” of his master. Especially to me.

Matthew Henry Presbyterian @wholebiblehenry

We have here, I. The main business of the epistle, which was to plead with Philemon on behalf of Onesimus, that he would receive him and be reconciled to him. Many arguments Paul urges for this purpose, Plm 1:8-21. The 1st Argument is taken from what was before noted, and is carried in the illative wherefore: "Seeing so much good is reported of thee and...

Commenting on Philemon 1:8-25

John Gill Reformed Baptist @doctorgill

Not now as a servant,.... That is, not only as a servant, for a servant he was, and was to be received as such; his call by grace had not dissolved the civil relation that was between him and his master, though it had added to it something that was above it, and greater than it: but above a servant; in a higher condition, as...