Christian ethics Stoicism a priori truth altruistic ethics aretaics axiom brocard canon casuistry categorical imperative code commandment comparative ethics convention deontology dictate dictum egoistic ethics empiricism ethical formalism ethical philosophy ethology ethonomics eudaemonics evolutionism form formula general principle guideline guiding principle hedonism imperative intuitionism law maxim mitzvah moral moral philosophy norm ordinance perfectionism postulate principium principle proposition regulation rubric rule self-evident truth settled principle situation ethics standard tenet theorem truism truth universal truth utilitarianism working principle working rule