The Apostle Paul
Romans 1:17ESV·traditional attribution

For in it the righteousness of God is revealed from faith for faith, as it is written, “The righteous shall live by faith.”

John Calvin Reformed @genevareformer

17. For “The causative, γὰρ, indicates a connection with the preceding, that the gospel is the power of God: the reason is, because by the gospel is revealed the righteousness of God, that is, made known by it is a way of righteousness and of obtaining life before God, which neither the law, nor philosophy, nor any other doctrine, was able to show.” — Pareus the righteousness of God, etc.

Matthew Henry Presbyterian @wholebiblehenry

Paul here enters upon a large discourse of justification, in the latter part of this chapter laying down his thesis, and, in order to the proof of it, describing the deplorable condition of the Gentile world. His transition is very handsome, and like an orator: he was ready to preach the gospel at Rome, though a place where the gospel was run down by those...

Commenting on Romans 1:16-18

John Gill Reformed Baptist @doctorgill

For therein is the righteousness of God revealed,.... By "the righteousness of God", is not meant the essential righteousness of God, the rectitude of his nature, his righteousness in fulfilling his promises, and his punitive justice, which though revealed in the Gospel, yet not peculiar to it; nor the righteousness by which Christ himself is righteous, either as God, or as Mediator; but that righteousness...