Paul doesn’t really answer the questions he raised in 3:1-8, except with the expression, “By no means.” The problems remain. So, if the Jews’ unfaithfulness causes God’s name to be blasphemed in all the world, and by that fact, the Gentiles have come to be included in God’s covenant, which was God’s intention from the beginning, how can God judge the Jews? So, some accuse Paul of saying, “Let’s do evil so that good may come of it.” He just says, “No way!” at this point, and leaves the real answer till later.
In 3:9-20, he starts that answer. The law, the covenant, speaks only to those under the convenant, and quoting Psalm 14:1-3, Psalm 53:1-3, (possibly Ecclesiastes 7:2), Psalm 5:10, Psalm 140:4, Psalm 10:7, Proverbs 1:16, Isaiah 59:7-8 and Psalm 36:2 Paul lays out God’s charge against Israel. The Gentiles have been indicted in Chapter 1, and now, after steering his Jewish Christian hearer into recognizing the problem with God’s chosen people, who have failed to be the light to the nations God called them to be, he makes sure they understand that the law, on which they rest their confidence, in fact, indicts them, and not just in one place, but essentially from cover to cover. The whole world then is accountable to God, or liable for punishment, because all flesh will not be justified in his sight by works of the law, because knowledge of sin comes through the law. His phrasing is important here. We tend to think of the Jews as “legalistic”, trying to claim God’s grace by observing the Law. Observance of Torah was rather, in Paul’s time, a response of gratitude to God for giving the covenant in the first place. Despite the usual translation, Paul does not say, “No one will be justified by works of the law,” but rather, “All flesh will not be justified by works of the law.” Claiming membership in the covenant people on the basis of flesh, circumcision, and observance of halakah will not be enough. The covenant is now extended beyond any limitation that flesh can impose: eating only what is allowed, circumcision, etc., — claiming these fleshly indicators of membership in the covenant will not suffice, because the Law (trying to observe it) only brings knowledge of failure to be faithful to the covenant. Anything one can do in the flesh is only an indictment — claiming status on the basis of gender, for example, or color or class; all of these bring knowledge of failure of justice. The Law makes it clear that God’s justice won’t be brought about by any such claim of membership in the covenant people. The covenant people extends beyond fleshly identification.