(Book: Mere Christianity by C. S. Lewis, chapter 1, “The Law of Human Nature”)
One of the most widespread arguments against atheism today is the claim that we know God exists because we all possess some kind of inherent knowledge of a universal and unchanging moral law, implying the existence of a universal and eternal Law-Giver. C. S. Lewis may not have been the first to make this argument, but he gives it an almost prototypical presentation in the first chapter of Mere Christianity, and it’s a safe bet that most modern proponents of the “moral law” argument took it directly or indirectly from Lewis. In a very real sense, then, we have an opportunity to study the roots of a major pillar holding up modern apologetics. And not surprisingly, we’re going to be most interested in the very large cracks at its base.