Romans 4:14 - Coke's Commentary on the Holy Bible

For if they which are of the law be heirs— The Apostle here speaks of the performance of the law, with reference to a moral impossibility: for it seems evident from what follows, that the law is to be considered as insisting on an obedience absolutely perfect: so that those good men who were justified under it, were not justified by it, but by the dispensation of grace under which Abraham was; which, though not a part of the covenant of God by Moses, was not, and could not be abrogated by it. See Galatians 3:17 and Doddridge.