"...this is one of the most crucial definitions for the whole of Christianity; that the opposite of sin is not virtue but faith."
The Sickness Unto Death
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"We, who are Jews by birth and not Gentile sinners, know that a man is justified not by performing what the Law commands but by faith in Jesus Christ. We ourselves are justified by our faith and not by our obedience to the Law, for we have recognised that no one can achieve justification by doing the 'works of the Law.' Now if, as we seek the real truth about justification, we find we are as much sinners as the Gentiles, does that mean that Christ makes us sinners? Of course not! But if I attempt to build again the whole structure of justification by the Law then I do, in earnest, make myself a sinner. For under the Law I 'died,' and now I am dead to the Law’s demands so that I may live for God. As far as the Law is concerned I may consider that I died on the cross with Christ. And my present life is not that of the old 'I,' but the living Christ within me. The bodily life I now live, I live believing in the Son of God, who loved me and sacrificed himself for me. Consequently I refuse to stultify the grace of God by reverting to the Law. For if righteousness were possible under the Law then Christ died for nothing!" (Galatians 2:15-21, Phillips)