Albert Barnes Commentary 2 Thessalonians 1:4

"so that we ourselves glory in you in the churches of God for your patience and faith in all your persecutions and in the afflictions which ye endure;" — 2 Thessalonians 1:4 (ASV)

So that we ourselves glory in you in the churches of God. That is, we mention your example to other churches and glory in it, as an evidence of what the gospel is capable of doing (1 Thessalonians 2:19; 1 Thessalonians 2:20).

Compare 2 Corinthians 9:2.

For your patience. Your patient endurance of trials.

And faith. Fidelity or constancy. You have shown unwavering confidence in God in your afflictions.

In all your persecutions and tribulation, that you endure (1 Thessalonians 2:14; 1 Thessalonians 4:13).

It would seem from this that the persecutions and trials to which the apostle referred in his first epistle were still continued.

For "endure," compare James 5:11.