Well to answer your question... lets first introduce fact. Natural law theory is based on the 'right or natural thing to do'. This theory was phased into systems of justice after WWII when the many...
It means essentially the same thing as the current 'in-vogue' phrase, "It is, what it is." It means the law is not negotiable. It may not seem just in some cases but it is, above all else, the law.