“In abstraction from specific religious or metaphysical traditions, there really is very little that natural law theory can meaningfully say about the relative worthiness of the employments of the will. There are, of course, generally observable facts about the characteristics of our humanity (the desire for life and happiness, the capacity for allegiance and affinity, the spontaneity of affection for one’s family) and about the things that usually conduce to the fulfillment of innate human needs (health, a well-ordered family and polity, sufficient food, aesthetic bliss, a sense of spiritual mystery, leisure, and so forth); and if we all lived in a Platonic or Aristotelian or Christian intellectual world, in which everyone presumed some necessary moral analogy between the teleology of nature and the proper objects of the will, it would be fairly easy to connect these facts to moral prescriptions in ways that our society would find persuasive. We do not live in such a world, however.”