Why do we have a moral duty to fulfill promises? Hume offers what today is called a practice theory of the obligation of promises: he explains it by appeal to a social convention. His view has inspired more recent practice theories. All practice theories, including Hume’s, are assumed by contemporary philosophers to have a certain normative structure, in which the obligation to fulfill a promise is warranted or justified by a more fundamental moral purpose that is served by the social (...) practice of promising or adherence to it. Recent practice theories do have this structure, but, I argue, Hume’s own does not. Hume’s account, while it does trace the origin of promises to convention, is instead a causal explanation of the moral sentiments we have toward fulfillment and violation of promises, sentiments he regards as normative in themselves and not susceptible of further warrant. He explains how a collectively-invented social practice becomes morally obligatory for us to conform to, without deriving its moral authority from a more basic principle. I discuss one objection often made to practice theories that, in its application to Hume, presupposes the incorrect interpretation, and show that while it is telling for Hume’s descendants, for Hume it misses the mark. Instead I make a different challenge to Hume, and suggest how he might meet it. (shrink)

Comment on Joseph Raz, From Normativity to Responsibility.

Conventionalists about promising believe that it is wrong to break a promise because the promisor takes advantage of a useful social convention only to fail to do his part in maintaining it. Anti-conventionalists claim that the wrong of breaking a promise has nothing essentially to do with a social convention. Anti-conventionalists are right that the social convention is not necessary to explain the wrong of breaking most promises. But conventionalists are right that the convention plays an essential role in any (...) satisfactory account of promising. A new conventionalism can explain this by appealing to special features of social conventions. Two of these special features have important implications for any moral requirements they mediate, such as the requirement to keep one's promises and the moral requirements attached to social or occupational roles. First, these requirements will not depend on features of a situation that are inaccessible to typical participants in the convention. Second, these requirements often cannot be tailored to fit the overly unusual circumstances of participants. (shrink)