Paul deals with this subject in much detail in his writings. He makes it very clear that a person can not be receive salvation from his sins by works of righteousness. He also goes on saying that one can not earn salvation.

Man has sinned and every single person in the whole world is a sinner. His sins can not be blotted out by doing works of righteousness because Bible says that our works of righteousness are just filthy rags in the sight of God.

So how can one be saved?
Paul says grace
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