This essay examines C.S. Lewis’s arguments in the lecture ‘The Reality of the Moral Law’. It first summarises the contrast drawn between physical laws and the moral law, then identifies three attempts to dismiss the latter and explains why each is found unconvincing. The discussion draws exclusively on the ideas presented in the supplied source material.
The Contrast Between Physical Laws and the Law of Human Nature
Lewis distinguishes sharply between what he terms ‘the law of nature’ and ‘the law of human nature’. Physical laws describe what invariably occurs. A stone released in mid-air always falls; an apple dropped from a tree obeys gravitation without choice or exception. These regularities simply report observed behaviour and carry no sense of obligation. By contrast, the law of human nature prescribes what people ought to do. Individuals recognise an external standard of conduct—fairness, honesty, unselfishness—yet frequently fail to meet it. This standard exists ‘above and beyond’ actual human actions; it does not describe what occurs but what should occur. Lewis notes two ‘odd’ facts about human beings: they are haunted by an idea of how they ought to behave, and they routinely fall short of that expectation. The resulting notion of ‘ought’ therefore points to a different kind of reality, one that is not reducible to physical facts.
Dismissive Attempts to Explain Away the Moral Law
Lewis considers at least three ways in which the moral law is commonly dismissed. The first treats morality as a matter of personal convenience. On this view, decency is simply whatever benefits the individual. Lewis finds the claim inadequate because people routinely judge actions according to intention rather than outcome. An intentional theft is blamed more severely than an accidental inconvenience, even when both produce equal annoyance. This disparity shows that moral assessment cannot be reduced to personal utility.
The second attempt explains morality as social utility—what ‘pays’ society as a whole. Lewis regards this explanation as circular. It still rests on the unexamined premise that one ought to be unselfish for the sake of others; the appeal to social benefit therefore presupposes the very obligation it seeks to explain. A third, related dismissal holds that the moral law is merely a human invention or fancy. Lewis counters that the sense of obligation is experienced as something we did not create, yet to which we find ourselves subject. If the law were only a product of human imagination, its persistent claim upon conduct would be difficult to account for.
Conclusion
Lewis maintains that the moral law constitutes an objective reality distinct from physical regularities and resistant to reductionist explanations. By acknowledging an ‘ought’ that humans neither invented nor consistently obey, the source material suggests that ethical obligations exert a genuine influence independent of material facts. This conclusion remains grounded solely in the distinctions and rebuttals outlined in the lecture.
References
- C.S. Lewis, ‘The Reality of the Moral Law’ (video lecture). Supplied source material.
