The Apostle Paul
2 Thessalonians 1:6ESV·traditional attribution

since indeed God considers it just to repay with affliction those who afflict you,

John Calvin Reformed @genevareformer

6 To appoint affliction. We have already stated why it is that he makes mention of the vengeance of God against the wicked — that we may learn to rest in the expectation of a judgment to come, because God does not as yet avenge the wicked, while it is, nevertheless, necessary that they should suffer the punishment of their crimes.

Matthew Henry Presbyterian @wholebiblehenry

Having mentioned their persecutions and tribulations, which they endured principally for the cause of Christ, the apostle proceeds to offer several things for their comfort under them; as, I. He tells them of the present happiness and advantage of their sufferings, Th2 1:5. Their faith being thus tried, and patience exercised, they were improved by their sufferings, insomuch that they were counted worthy of the kingdom of God.

Commenting on 2 Thessalonians 1:5-10

John Gill Reformed Baptist @doctorgill

Seeing it is a righteous thing with God,.... That which is righteous in itself, is righteous in the sight of God, but it is not always so with men; men may think it a righteous thing that they should be rewarded for persecuting the followers of Christ, supposing they hereby do God good service; but on the contrary, with God, and in his sight and...