After declaring that it is only through Christ and His mercy can we avoid the judgment of the law which He does so that His righteousness can be seen, Paul now speaks about the law. The law make all under judgment, so no one can boast of their works for we are justified by faith separate from any works that we might do. Since justification is separate from the deeds of the law, the giving of the law can make no difference between the Jews and the Gentiles. He is the God of all and all are saved by faith in Him. That does not mean that law is abolished, rather justification by faith makes the law more visible.