John Chrysostom
Then he says, "For if Abraham was justified by works, he has something to boast of, but not before God." Having said that God justifies the circumcision from faith and the uncircumcision through faith, and having sufficiently explained this above, he confirms it by Abraham's example even more than he had promised.
He brings faith and works into contest and concentrates the whole struggle around the righteous man. This is not without purpose. He greatly magnifies Abraham by calling him forefather, so that by this he may compel the Jews to obey him in everything.
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Do not speak to me of a Jew, Paul reasons. Do not set this or that man as an example. I go up to the head of all, from whom circumcision itself took its beginning. "For if Abraham was justified by works," says the Apostle, "he has something to boast of, but not before God."
The saying is unclear, and therefore it must be made clearer. There are two kinds of boasting, one from works and the other from faith. When the Apostle says, "If he was justified by works, he has something to boast of, but not before God," he indicates that one can have boasting from faith, and much greater boasting.
Paul's great power is especially revealed in this, that he turned the subject of his argument to the opposite conclusion. He proved that salvation through faith possesses far more of everything belonging to salvation from works, namely boasting and boldness.
The one who boasts in works can display his own labors. But the one who counts it an honor that he believes in God presents a much better ground for boasting, since he glorifies and magnifies the Lord (cf. Ps 33:3; Ps 43:9; Jer 9:24; 2 Cor 10:17-18; Eph 2:8-10).
By faith in God he recognized as true what the nature of visible things did not reveal. By this he proved sincere love for God and solemnly proclaimed His power. This belongs to the noblest soul, to a philosophical mind, and to lofty thought.
Not to steal and not to murder belong to ordinary people. But to believe that God is able to accomplish the impossible requires a nobly minded spirit firmly attached to God. This is a sign of true love.
The one who fulfills the commandments honors God. But the one who is made wise by faith honors Him much more. The former obeyed Him. The latter acquired the proper understanding of God, and glorified and magnified Him more than he could by works.
The first boasting belongs to the doer of good works. The latter glorifies God and belongs wholly to Him. For the believer boasts in his lofty understanding of God, which also passes into his glory.
For this reason the Apostle says that he has boasting before God. Yet this is not for this reason alone, but for another also. The believer boasts not only because he sincerely loved God, but also because he was counted worthy of great honor and love from Him.
As he loved God by having a lofty understanding of Him, which is a proof of love, so God also loved him. Though he was guilty before God a thousand times over, He not only freed him from punishment, but made him righteous. Therefore the believer has ground to boast, as one counted worthy of great love.