For if Abraham were justified by works, he has something in which to boast; but not before God.
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Ambrosiaster
AD 400
This is a rhetorical argument. For Abraham indeed does have glory before God, but because of the faith by which he was justified, because nobody is justified by the works of the law in a way which would give him glory before God. And because those who keep the law are still being justified, Paul adds: “If Abraham was justified by works, he has something to boast about, but not before God.” Commentary on Paul’s Epistles.
Since Abraham without the law obtained glory not by the works of the law (as if he could fulfill the law in his own strength), since the law had not yet been given, the glory belongs to God, not to him. For he was justified not by his own merit, as if by works, but by the grace of God through faith.
What can we say to those who insist that Abraham was justified by works because he was ready to sacrifice his son Isaac on the altar? Abraham was already an old man when God promised him that he would have a son and that his descendants would be as countless as the stars of the sky. Abraham piously believed that all things are possible with God and so exercised this faith. God reckoned him to be righteous on this account and gave Abraham a reward worthy of such a godly mind, viz., the forgiveness of his previous sins…. So even if Abraham was also justified by his willingness to sacrifice Isaac, this must be regarded as an evident demonstration of a faith which was already very strong. .
If Abraham were justified by works, or by his own works, he might have glory, and be commended by men, who judge only according to outward appearances; but not with God: that is, he could not be truly justified, so as to deserve a reward in heaven, without faith and the grace of God. (Witham)
Not with God. Whatever glory or applause such works might procure from men, they would be of no value in the sight of God. (Challoner)
For someone to be justified by faith if he had no works was unusual. But for one who had plenty of good works to delight in being justified not by works but by faith—that was something to cause amazement. It put the power of faith in a new light. What Paul is saying here is not plain, and so it is necessary to make it clearer. There are two kinds of boasting—one of works and one of faith…. Paul’s great strength is particularly displayed in this, that he turns the objection around and shows that what seemed to favor the idea of salvation by works (viz., boasting) belonged much more truly to salvation by faith. For the man who boasts in his works is boasting about himself, but the man who finds his honor in having faith in God has a much better reason for boasting, because he is boasting about God, not about himself. … To abstain from stealing or murder is a minor accomplishment compared to believing that God can do the impossible…. The believer boasts not only because he sincerely loves...
