John Calvin on Philemon 1:12

12. Receive him, that is, my bowels. Nothing could have been more powerful for assuaging the wrath of Philemon; for if he had refused to forgive his slave, he would thus have used cruelty against “the bowels” of Paul. This is remarkable kindness displayed by Paul, that he did not hesitate to receive, as it were into his bowels, a contemptible slave, and thief, and runaway, so as to defend him from the indignation of his master. And, indeed, if the conversion of a man to God were estimated by us, at its proper value, we too would embrace, in the same manner, those who should give evidence that they had truly and sincerely repented.