A law, in the most general and comprehensive acceptation in which the term, in its literal meaning, is employed, may be said to be a rule laid down for the guidance of an intelligent being by an intelligent being having power over him. Under this definition are concluded, and without impropriety, several species. It is necessary to define accurately the line of demarcation which separates these species from one another, as much mistiness and intricacy has been infused into the science of jurisprudence by their being confounded or not clearly distinguished. In the comprehensive sense above indicated, or in the largest meaning which it has, without extension by metaphor or analogy, the term law embraces the following objects:—Laws set by God to his human creatures, and laws set by men to men.
The whole or a portion of the laws set by God to men is frequently styled the law of nature, or natural law: being, in truth, the only natural law of which it is possible to speak without a metaphor, or without a blending of objects which ought to be distinguished broadly. But, rejecting the appellation Law of Nature as ambiguous and misleading, I name those laws or rules, as considered collectively or in a mass, the Divine law, or the law of God.
(John Austin, The Province of Jurisprudence Determined, in The Province of Jurisprudence Determined and The Uses of the Study of Jurisprudence [Indianapolis: Hackett Publishing Company, 1998 (book first published in 1832)], 10 [italics in original])