This distinction between “revealed truths” and “truths of reason” implies that at least some revealed truths are not also truths of reason. By hypothesis, such truths would have remained unknown and unknowable had they not been revealed by God. (It therefore follows that without revelation, Christian theology could not exist, on the Cooperation account.) Paradigmatic instances of revealed truths are the doctrine of the Trinity, and the doctrine of the Incarnation. Throughout the centuries, most, though not all, broadly orthodox Christian thinkers have held that human beings could not reason their way to the truth of these doctrines without the aid of divine revelation.