An answer from C.S. Lewis

Jen and I were listening to a lecture this morning on The Life and Writings of C. S. Lewis by Louis Markos (good stuff if you want to check it out from the library). I like his line of reasoning, so I'm transcribing it for you.

From lecture 3: Ethics and the Tao

What is the strongest evidence against Christianity? The strongest argument is "look at all the injustice and suffering in the world, how could a good God have created it?" That is really, to me, the best attack on Christianity--why is this world so unjust? But do you know what Lewis says? How do we know our world is unjust? The only way we could know our world is unjust is if we have a just measure to measure it against. Do you follow me here? To put it in C. S. Lewis' words, "a man does not call a line crooked unless he has some idea of a straight line." How do we know that the world is unjust and unfair unless we have some kind of supernatural standard to tell us what is just and what is fair. So, you see, the greatest argument against Christianity becomes an argument in favor of it.