Therefore we conclude that a man is justified by faith without the deeds of the law.
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Ambrosiaster
AD 400
Paul says that a Gentile can be sure that he is justified by faith without doing the works of the law, e. g., circumcision or new moons or the veneration of the sabbath. Commentary on Paul’s Epistles.
This must not be understood in such a way as to say that a man who has received faith and continues to live is righteous, even though he leads a wicked life.
Paul does not say a “Jew” or “one under the law” but widens the discussion and opens the doors of faith to the world, saying a “man,” i.e., the name common to our race.