Vagueness, logic and ontology

Resorting to natural law is one way of conveying the philosophical conviction that moral norms are not merely conventional rules.

Accordingly, the notion of natural law has a clear metaphysical dimension, since it involves the recognition that human beings do not conceive themselves as sheer products of society and history. And yet, if natural law is to be considered the fundamental law of practical reason, it must show also some intrinsic relationship to history and positive law.