What is at issue between particularism and generalism is the nature of moral rationality. Particularists maintain that there can be reasons—moral reasons—even if the features that give us those reasons function variably rather than invariably in their reason-giving. Generalists suppose that this is not possible. They claim either that all reasons, when properly understood, must function invariably, or that there is an invariant core even if there is a variable periphery. To argue for the first