Logic can help us see some things clearly. We can see, for example, that a square is not a circle. If we say at the outset that reason cannot reveal anything about ultimate reality, then we have already said something about ultimate reality—i.e., that it is unknowable by reason. How could we know that? While it is right to be humble, the hypothesis that reason cannot shine light on grand truths is itself a grand hypothesis. When I first began working with reason, I vastly underestimated its powers.