Thus, either Christianity is false, or reason is false, or—if both are true—there can never be any real contradiction at all between them, since truth cannot contradict truth. Aquinas is speaking of faith and reason objectively, not subjectively. The objective stock of propositions revealed by God for us to believe, and the objective stock of propositions provable by our reason properly used, do not contain any contradictions. But subjectively, we fallen humans can easily err. We can misunderstand