John Chrysostom

"The Lord give mercy to the house of Onesiphorus, for he oft refreshed me, and was not ashamed of my chain. But, when he was in Rome, he sought me out diligently and found me." Observe how he everywhere speaks of the shame, and not of the danger, lest Timothy should be alarmed. And yet it was a thing that was full of peril. For he gave offense to Nero by making friends with one of his prisoners. …

Homily on 2 Timothy 3 ↗

Theophylact of Ohrid

Look at the love of wisdom of the apostle. He did not reproach those who abandoned him, but simply pointed out what had happened. For the one who cared for him, he prays, and not only for him, but also for his entire household: so virtuous were they, so had Onesiphorus raised them. Like some combatant exhausted from the heat, he granted me refreshment not once, but many times. So must we also act, always and in everything helping those who are engaged in some good work: in this way we shall be partakers with them in the rewards. …

Commentary on 2 Timothy ↗

Ignatius of Antioch

Crocus also, worthy both of God and you, whom we have received as the manifestation of your love to us, hath in all things refreshed me, and "hath not been ashamed of my chain," as the Father of our Lord Jesus Christ will also refresh him; together with Onesimus, and Burrhus, and Euplus, and Fronto, by means of whom I have, as to love, beheld all of you. May I always have joy of you, if indeed I be worthy of it.

Epistle of Ignatius to the Ephesians ↗

Thomas Aquinas

Then when he says, the Lord gives mercy to the house of Onesiphorus, he shows the progress others are making, and especially a certain Onesiphorus, stressing in particular the good works he performed for the Apostle in Rome and then in Asia. In regard to the first he calls three things to mind: first, he wishes him God's mercy; second, he shows the merits of mercy; third, the time of mercy. …

Commentary on 2 Timothy ↗