Natural law theory is one of the most significant theories in the philosophy of Classical Realism. Natural law or the law of nature is a theory that suggests the existence of a law whose subject matter is set by nature and that thus has authority everywhere. By natural law we mean the “unwritten law” that is more or less similar for everyone and everywhere. To be more accurate, natural law is the idea of a system of set moral values that is universal to all humanity and, as it is normally posited, is identifiable by human reason solely. Thus natural law is differentiated from positive law (which is man-made), the formal legal endorsements of a particular society, and is more about