John Chrysostom
"Blessed are those whose lawless deeds are forgiven." At first sight, the Apostle brings in a testimony that does not fit, since David did not say, "Blessed are those whose faith has been counted as righteousness." But the Apostle does this intentionally, not from ignorance, in order to show the greater superiority of faith.
If the one who received forgiveness by grace is blessed, then the one justified and manifesting faith is much more blessed. Where there is blessedness, every shame is removed and great glory remains. For blessedness is the fullness of rewards and glory.
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Therefore, when speaking of the advantage of the one who works, "To the one who works, the wage is not counted according to grace" (Rom 4:4), the Apostle does not confirm this from Scripture. But he proves the superiority of the believer by testimony from Scripture, with David's words: "Blessed are those whose lawless deeds are forgiven, and whose sins are covered."
Why, the Apostle asks, are you troubled that you receive remission of sins not by debt, but by grace? Behold, precisely this one, who received remission by grace, is called blessed. The prophet would not have called him blessed unless he knew that he enjoyed great glory. And the Apostle does not say that such remission belongs to circumcision. What then does he say?