(At the link, click again for video or MP3.) -- For centuries, the idea that human beings have an inherent sense of right and wrong has intrigued political and religious thinkers. The notion of a “natural” moral law has been a key driver of much Christian political thought in the west. It has helped shape the development of religious freedom and the concept of rights, and its influence on America’s Founding Fathers was fundamental. In today’s post-modern society, however, the concept often prompts confusion and controversy. Even critics who might accept the reality of a moral law in theory wonder...