He who knows he is a fool is not the biggest fool; he who knows he is confused is not in the worst confusion. The man in the worst confusion will end his life without ever getting straightened out; the biggest fool will end his life without ever seeing the light. If three men are traveling along and one is confused, they will still get where they are going - because confusion is in the minority. But if two of them are confused, then they can walk until they are exhausted and never get anywhere - because confusion is in the majority.
What I have called the internal morality of law is in this sense a procedural version of natural law, though to avoid misunderstanding the word "procedural" should be assigned a special and expanded sense so that it would include, for example, a substantive accord between official action and enacted law. The term "procedural" is, however, broadly appropriate as indicating that we are concerned, not with the substantive aims of legal rules, but with the ways in which a system of rules for governing human conduct must be constructed and administered if it is to be efficacious and at the same time remain what it purports to be.