Romans 3:27 : Where then is the glorying? It is excluded. By what manner of law? of works? Nay: but by a law of faith. If a man were to live a perfect life, he would have grounds for boasting that he had always done the right thing, that no taint of sin ever soiled his spotless life, and that he stood justified on his own record. But none so lived, for all have sinned.
In recognizing one's self as a condemned sinner, there is a cause for humility, but no grounds for boasting. And the greatest ground for humility is the knowledge that an innocent Person died to save me from my own folly. Instead of being the proud possessor of a spotless character, I have to rely on another to cleanse me from my own defilement. And this depending on the innocent to justify the guilty is what Paul calls the "law of faith." This law of faith is the plan, or ar-rangement, in which is required faith in Jesus, who died for us.