4. Is the light of reason alone sufficient to know the mystery of God?
In coming to a knowledge of God by the light of reason alone man experiences many difficulties. Indeed, on his own he is unable to enter into the intimacy of the divine mystery. This is why he stands in need of being enlightened by God’s revelation, not only about those things that exceed his understanding, but also about those religious and moral truths which of themselves are not beyond the grasp of human reason, so that even in the present condition of the human race, they can be known by all with ease, with firm certainty and with no admixture of error.
Given the prior definition of God as creator and end of all that is, and humankind’s bumbling history, only a pathological lack of honest humility would doubt this!