The idea that there is such an analytic connection will hardly come as news. It amounts to no more and no less than an endorsement of the claim that all reasons are 'internal', as opposed to 'external', to use Bernard Williams's terms (Williams 1980). Or, to put things in the way Christine Korsgaard favours, it amounts to an endorsement of the 'internalism requirement' on reasons (Korsgaard 1986). But how exactly is the internalism requirement to be understood? What does it tell (...) us about the nature of reasons? And where-in lies its appeal? My aim in this paper is to answer these ques- tions. (shrink)

Some contemporary theories treat phenomena like weakness of will, compulsion and wantonness as practical failures but not as failures of rationality: say, as failures of autonomy or whatever. Other current theories-the majority see the phenomena as failures of rationality but not as distinctively practical failures. They depict them as always involving a theoretical deficiency: a sort of ignorance, error, inattention or illogic. They represent them as failures which are on a par with breakdowns of theoretical reason; the failures may not (...) have exact theoretical analogues, exact analogues in the breakdown of belief, but they are of essentially the same, cognitive kind. Our approach gives us quite a different view of things. The pathologies which we identify in our taxonomy are distinctively rational failures and distinctively practical failures; they are failures of pure practical reason. (shrink)