Lewis contends that the moral law is universal, cutting across different cultures and historical periods. Despite variations in customs and practices, the core principles of morality remain consistent. He challenges the notion that moral relativism can explain the differences in moral codes, arguing instead that these differences are superficial. He writes, 'If anyone will take the trouble to compare the moral teaching of, say, the ancient Egyptians, Babylonians, Hindus, Chinese, Greeks, and Romans, what will really strike him will be how very like they are to each other and to our own.' This universality supports his claim that the moral law is a fundamental aspect of human nature. | C.S. Lewis | Mere Christianity

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The Universality and Objectivity of Moral Law

Lewis contends that the moral law is universal, cutting across different cultures and historical periods. Despite variations in customs and practices, the core principles of morality remain consistent. He challenges the notion that moral relativism can explain the differences in moral codes, arguing instead that these differences are superficial. He writes, 'If anyone will take the trouble to compare the moral teaching of, say, the ancient Egyptians, Babylonians, Hindus, Chinese, Greeks, and Romans, what will really strike him will be how very like they are to each other and to our own.' This universality supports his claim that the moral law is a fundamental aspect of human nature.

-- C.S. Lewis