The idea that a norm that does not conform to the natural law cannot be legally valid is the defining thesis of conceptual naturalism. As William Blackstone describes the thesis, "This law of nature, being co-eval with mankind and dictated by God himself, is of course superior in obligation to any other. It is binding over all the globe, in all countries, and at all times: no human laws are of any validity, if contrary to this; and such of them as are valid derive all their force, and all their authority, mediately or immediately, from this original" (1979, 41). In this passage, Blackstone articulates the two claims that constitute the theoretical core of conceptual naturalism: 1) there can be no legally valid standards that conflict with the natural law; and 2) all valid laws derive what force and authority they have from the natural law.
John Stuart Mill (United Kingdom, 1806–1873) is one of the first champions of modern "liberalism." As such, his work on political economy and logic helped lay the foundation for advancements in empirical science and public policy based on verifiable improvements. Strongly influenced by Bentham's utilitarianism , he disagrees with Kant's intuitive notion of right and formulates the "highest normative principle" of morals as: Actions are right in proportion as they tend to promote happiness; wrong as they tend to produce the reverse of happiness.