Unequal to the Observance of Law, Flee to the Grace of Christ...

"I go farther, and assert, that what the Scriptures declare never shall be, is impossible; although, if we are to debate about a word, the very thing was expressed by Peter, (Acts 15.) when he spoke of the yoke of the law as that which none of their fathers could bear. It is an error to suppose that this refers only to ceremonies: for what so very arduous was there in ceremonies as to make all human strength fail under the burden of them? He undoubtedly means that all mankind from the beginning were, and still are, unequal to the observance of the law, and that therefore nothing remains but to flee to the grace of Christ, which, loosing us from the yoke of the law, keeps us as it were under free custody. And it is to be observed that he is speaking of the regenerate, lest the Fathers of Trent quibble, and say that he spoke of the weakness of the flesh when the assistance of the Spirit is wanting. For he affirms that prophets and patriarchs, and pious kings, however aided by the Spirit of God, were unable to bear the yoke of the law, and declares, without ambiguity, that the observance of the law was impossible..."

John Calvin, Acts of the Council of Trent with the Antidote