Philemon 1:16

‘No longer as a servant, but more than a servant, a brother beloved, specially to me, but how much rather to you, both in the flesh and in the Lord.’

For Onesimus would now come to Philemon, no longer as a servant, but as more than a servant, as a beloved brother. Just as, he then points out, Onesimus is beloved to him Paul. How much more then will he be beloved to the one who had owned him, and had probably watched him grow up, thus feeling towards him with natural human feelings, as well as with the spiritual feeling that comes from him being a brother in the Lord and both therefore having a close bond in knowing the Lord.