The second thing that we are to humble ourselves unto in the law ofgrace is, a firm persuasion, exerting itself effectually in all our obedience, that there is not a righteousness to be obtained before God by the performance of any duties or obedience of ours whatever. That this lies in the law of the grace of God, the apostle disputes at large, Rom. 4:13–15, "If," saith he, "righteousness be by the law,"—that is, by our obedience to God according to the law,—"then faith and the promise serve to no purpose.