Romans 3:27-30b

“Where is boasting then? It is excluded. By what law? Of works? No: but by the law of faith.
Therefore we conclude that a man is justified by faith without the deeds of the law. Is He the God of the Jews only? And not also of the Gentiles? Yes, of the Gentiles also, since there is one God, who shall justify the circumcision by faith, and the uncircumcision through faith.”

We know that, if God were to require our justification by the deeds of the law, we would all perish, for we are all guilty of all the law. The Jew cannot claim the Law for his salvation, for he knowingly violates its written precepts. The Gentile cannot hide from the Law for his justification; he is equally guilty and equally condemned. 

But praise be to God, who has justified sinful men, not by our deeds, but by faith in Him Who graciously offers mercy, upon the credit of Him Who knew no sin, Who presented Himself a ransom for us, whether Jew or Gentile.