John Chrysostom

"But when Timothy came even now unto us from you, and brought us glad tidings of your faith and love, and that ye have good remembrance of us always, longing to see us, even as we also to see you." "Brought us glad tidings," he says. Do you see the excessive joy of Paul? he does not say, brought us word, but "brought us glad tidings." So great a good did he think their steadfastness and love. For it was necessary, the one remaining firm, that the other also must be steadfast. …

Homily on 1 Thessalonians 4 ↗

Theophylact of Ohrid

That is, you remember us with praises and approval. Listen, disciples, and learn to always preserve a good memory of your teachers. For by this you will bring benefit to yourselves, not to them. It is a very great consolation and joy for the Thessalonians that Paul knows he is loved by them – this will inflame their love even more.

Commentary on 1 Thessalonians ↗

Thomas Aquinas

Then when Paul says: but now that Timothy has come to us from you, he comments that Timothy spoke of their good practices towards God and towards the Apostle: faith and love towards God: "For neither circumcision counts for anything, nor uncircumcision, but a new creation" (Gal. 6:15); faith also towards the Apostle, so Paul says: you always remember us kindly. "The memory of Josiah is like a blending of incense prepared by the art of the perfumer" (Sir. 49:1). "The memory of the righteous is a blessing" (Prov. 10:7). …

Commentary on 1 Thessalonians ↗