 Particularists are united in their opposition to moral principles and generalists are united in their allegiance to them. What, though, is a moral principle? At least three conceptions of principles are worth distinguishing. First, there are principles qua standards. Standards purport to offer explanations of why given actions are right or wrong, why a given consideration is a reason with a certain valence and weight, why a given character trait is a virtue, and the like. An especially robust metaphysical spin on this conception understands standards as being truth-makers for moral propositions (cf. Armstrong 2004). Second, there are principles qua guides. These purport to be well suited to guiding action. Third, there are principles purporting to play both of these roles simultaneously—action-guiding standards.