This paper examines H.A. Prichard's defense of the view that moral duty is underivative, as reflected in his argument that it is a mistake to ask “Why ought I to do what I morally ought?”, because the only possible answer is “Because you morally ought to.” This view was shared by other philosophers of Prichard's period, from Henry Sidgwick through A.C. Ewing, but Prichard stated it most forcefully and defended it best. The paper distinguishes three stages in Prichard's argument: one (...) appealing to his conceptual minimalism, one an epistemological argument that parallels Moore's response to skepticism about the external world, and one arguing that attempts to justify moral duties on non-moral grounds distort the phenomena by giving those duties the wrong explanation or ground. The paper concludes by considering Prichard's critique of ancient ethics and in particular the ethics of Aristotle. The paper is broadly sympathetic to Prichard's position and arguments; its aim is partly to make a case for him as a central figure in the history of ethics. (shrink)

The rhetoric of Principia Ethica, as of not a few philosophy books, is that of the clean break. Moore claims that the vast majority of previous writing on ethics has been misguided and that an entirely new start is needed. In its time, however, the book’s claims to novelty were widely disputed. Reviews in Mind, Ethics, and The Journal of Philosophy applauded the clarity of Moore’s criticisms of Mill, Spencer, and others, but said they were “not altogether original,” had for (...) the most part “already been brought out by other critics,” and were even “the standard criticisms.”1 To the Mind reviewer, “The book indicates throughout how strongly the author has been affected by Sidgwick’s views.”2 Hastings Rashdall rejected as historically inaccurate Moore’s claim that only Sidgwick before him had recognized that “good” is indefinable: “To say nothing of writers who (like Mr. Moore and myself) learned the doctrine largely from Sidgwick, I should contend that it was taught with sufficient distinctness by Plato ..., Aristotle, and a host of other writers who have studied in their school.”3 Rashdall also described Moore’s principle of organic unities as just “a new and striking way of stating a very old truth.”4 Some recent commentators have taken a similar line. Bernard Williams has said that much of Principia Ethica comes from Sidgwick,5 while Thomas Baldwin, discussing the book’s substantive values, has said the principle of organic unities “was expressly stated by Bradley,” while “McTaggart had for some years extolled the value of love, and the value of art is a central theme of romanticism.”. (shrink)