God “...will repay each person according to what they have done.” To those who by persistence in doing good seek glory, honor and immortality, he will give eternal life. But for those who are self-seeking and who reject the truth and follow evil, there will be wrath and anger. There will be trouble and distress for every human being who does evil: first for the Jew, then for the Gentile; 10 but glory, honor and peace for everyone who does good: first for the Jew, then for the Gentile. 11 For God does not show favoritism. - Rom 2:6-11
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God is not pointing to man's moral ability but highlighting his inability. To read this out of context and to think that the covenant of works is attainable by human effort, or by the flesh, will be the downfall of many men. It is essential to understand this in context ... your life depends on it.