1. The notion. Natural law is here the natural moral law, using a broader sense of the word “law” than in the physical “laws of nature”, where it is natural necessity, the order of non-rational nature. There the natural laws of physics and biology are at work, which are studied by the natural sciences. Such law makes no claims on man’s freedom and hence has no moral character. But the natural moral law in a wide sense embraces the whole field of mo…