Romans 4:1

He had said that the world had become guilty before God, and that all had sinned, and that boasting was excluded and that it was impossible to be saved otherwise than by faith. He is now intent upon showing that this salvation, so far from being matter of shame, was even the cause of a bright glory, and a greater than that through works. For since the being saved, yet with shame, had somewhat of dejection in it, he next takes away this suspicion too. And indeed he has hinted at the same already, by calling it not barely salvation, but "righteousness. Therein" (he says) "is the righteousness of God revealed." For he that is saved as a righteous man has a confidence accompanying his salvation. And he calls it not "righteousness" only, but also the setting forth of the righteousness of God. But God is set forth in things which are glorious and shining, and great. And he calls him "father, as pertaining to the flesh," to throw them out of the genuine relationship to him, and to pave the Gentiles' way to kinsmanship with him. And then he says, "For if Abraham were justified by works, he hath whereof to glory: but not before God." After saying that God "justified the circumcision by faith and the uncircumcision through faith," and making the same sufficiently sure in what he said before, he now proves it by Abraham more clearly than he promised, and pitches the battle for faith against works, and makes this righteous man the subject of the whole struggle. For the great power of Paul is especially displayed in this, that he turns what is objected to the other side, and shows that what seemed rather to be on the side of salvation by works, viz. glorying or boldness of claim belonged much more truly to that by faith. For he that glorieth in his works has his own labors to put forward: but he that finds his honor in having faith in God, has a much greater ground for glorying to show, in that it is God that he glorifieth and magnifieth.