John Chrysostom — on Phlm 1:10 (Homily on Philemon 2)

“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.”