John Chrysostom

What means, "What manner of entering in we had unto you"? That it was full of dangers, and numberless deaths, but that none of these things troubled you. But as if nothing had happened, so you adhered to us; as if ye had suffered no evil, but had enjoyed infinite good, so you received us after these things. For this was the second entering. They went to Beroea, they were persecuted, and when they came after this they so received them, as though they had been honored by these also, so that they even laid down their lives for them. …

Homily on 1 Thessalonians 2 ↗

Basil of Caesarea

Whence is it that we are Christians? Through our faith, would be the universal answer. And in what way are we saved? Plainly because we were regenerate through the grace given in our baptism. How else could we be? And after recognising that this salvation is established through the Father and the Son and the Holy Ghost, shall we fling away "that form of doctrine" which we received? …

On the Spirit 10.26 ↗

Theophylact of Ohrid

That is, that our coming to you was joined with a thousand deaths, and yet nothing turned you against us. On the contrary, you yourselves, having been exposed to dangers on our account, did not reject us, but treated us as though you had enjoyed countless blessings. This was the second entrance. For the apostle, having departed from Thessalonica to Berea, was persecuted, and having come from there to the Thessalonians, was so received by them that they were ready to lay down their lives for him. …

Commentary on 1 Thessalonians ↗

Thomas Aquinas

Then when Paul says: "for they themselves report concerning us," he remarks on the praise which they had received from others, because, "they themselves report concerning us what a welcome we had among you." A similar point is made in Proverbs (31:31): "Give her of the fruit of her hands, and let her works praise her in the gates." Those who commend you praise my preaching and your conversion. …

Commentary on 1 Thessalonians ↗