It's an important concept in theology but I feel like we don't discuss it frequently enough. Apart from Scripture it is the other part of divine revelation, the general revelation in Nature as opposed to the special revelation in Scripture. Natural Law is the concept which was pioneered by the ancient Greeks and Romans and so isn't even a purview of Christianity, but of reason as such. As Saint Paul saith, it a law written on every man's heart. With this truth men in centuries past have been able to corroborate Christian (especially revealed) truth, such as the complementarity of the genders, objectivity of truth, the creator-creature distinction, and even elementary things, such as that God exists even if we don't read about Him in the Bible. Here is an example: http://ndpr.nd.edu/news/61520-knowi...precepts-and-inclinations-to-deriving-oughts/ What are your guys thoughts about the matter?