John Chrysostom

"Wherefore," saith he, "my brethren, beloved and longed for, my joy and crown, so stand fast in the Lord, my beloved." "So." How? Unmoved. See how he addeth praise after exhortation, "my joy and my crown," not simply joy but glory too, not simply glory but my crown too. Which glory nought can equal, since it is the crown of Paul. "So stand fast in the Lord, my beloved," i.e. in the hope of God.

Homily on Philippians 13 ↗

Theophylact of Ohrid

So, he says, although you see them rejoicing and being glorified, yet you stand as you have stood, in the hope that we shall be glorified with Christ, and do not retreat from this hope. Notice with what praises he extols them. "Brethren," he says, and not simply, but "beloved," and besides that also "longed for," that is, such ones whom my soul yearns to behold. And further: "joy," and not simply, but also "crown," than which there is nothing more glorious for him. And before the exhortation he praised them, and after it again. …

Commentary on Philippians ↗

Thomas Aquinas

Above, he proposed examples for them to follow; here in a moral exhortation he shows how they should conduct themselves: first, how they should act in the future; secondly, he commends them on the past (4:10). In regard to the first he does two things: first, he urges them to persevere in what they already have; secondly, to advance to something better (4:4). …

Commentary on Philippians ↗