Phlm 1:10

“And note, on the other hand, also Paul's fervency. He preached the gospel bound and scourged. Oh, that blessed chain, with what great effort did it labor that night, and what children did it birth! Yes, of them, too, may he say, "Whom I have begotten in my bonds." Observe how Paul glories. He will have the children born this way considered even more illustrious! Observe how transcendent is the glory of those bonds, in that they give luster not only to him that wore them but also to those who were on that occasion begotten by him.”

“Again the chains are mentioned to shame him into compliance, and then the name. For he has not only extinguished his anger, but has caused him to be delighted. For I would not have called him my son, he says, if he were not especially profitable. What I called Timothy, that I call him also. And repeatedly showing his affection, he urges him by the very period of his new birth, "I have begotten him in my bonds," he says, so that on this account also he was worthy to obtain much honor, because he was begotten in his very conflicts, in his trials in the cause of Christ.”

“In wishing to obtain what he asks for, he now asserts that he is pleading not for Philemon's slave, but for his own son. And regarding that son whom he has begotten in the chains of the gospel, that is, which he endured for the sake of Christ's gospel.”

“Now Paul uses the name of Onesimus, but only after signaling the profound change that has occurred [i.e., Onesimus's conversion].”

“Indeed the epistle was written in behalf of the slave, and having returned him, though he had done wrong, he was improving through the Apostle's teaching. Now many have benefitted from it, indeed, first and foremost those who are zealous. For if Paul makes such great haste for the fugitive and repentant thief, how much more shall we not be lazy for the brethren. Secondly, one must not give up on the servile class, even if it strains the uttermost limits of wickedness. Oh how the thief and fugitive became so virtuous! Thirdly, its not appropriate for slaves to run away from their masters. For if Paul now insures Philemon that Onesimus was now thankful to serve him and not wishing to defy his superior, how much more should we ought not to do it. For if the wonderful servant is still fit to remain in his job, and their masters realize it, then he may be useful in everything else in the household.”

“He has not yet mentioned the name of the one on whose behalf he is interceding. He first softens Philemon with praise of the servant, calling him his son. Why does he call him so? Because, he says, I begot him, that is, I instructed him with the Gospel and commanded that the one who believed be baptized, and this in difficult circumstances: in chains. Having thus softened his heart, he finally mentions the name.”

“Having expressed his confidence in Philemon's goodness, here he states his request. And first he indicates the person on whose behalf he pleads; second, he concludes the request. The first is subdivided into two, because first by describing the person he shows that he has received him in spiritual birth; second, by a change of status. Therefore he says, I plead with you for my own son, whom I have begotten in prison, for Onesimus, who is his present concern. And acquiring a son in default of time, he loves him more, as an old man loves sons born to him in his old age. Genesis 37:3: 'Now Israel loved Joseph above all his sons, because he had him in his old age.' This one [Onesimus] was given birth in chains.”

“It is not a great thing to humble oneself when one is lowly, but it is commendable for a noble man to humble himself. Therefore, the Apostle asks him, to whom he has the authority to command, to be in all things a model for the advancement of merits. Therefore, when Onesimus, a fugitive, returned to seek divine assistance, the Apostle baptized him while he was in custody in the city of Rome, seeing the hope of usefulness in him.”

“Of Borea in Macedonia, Ones Imus, once the servant of Philemon.”

“Paul mentions Philemon first, praising the servant as a beloved child, because he says he also baptized him. For this is the one, "I have begotten while in my chains." Therefore, having calmed his anger through these things, he thus gives the name "Onesimus", he says.”