Reasons for Actions and Desires

Abstract

It is an assumption common to many theories of rationality that allpractical reasons are based on a person's given desires. I shall callany approach to practical reasons which accepts this assumption a `Humean approach'. In spite of many criticisms, the Humean approach has numerous followers who take it to be the natural and inevitable view of practical reason. I will develop an argument against the Humean view aimingto explain its appeal, as well as to expose its mistake. I focus on just one argument in favour of the Humean approach, which I believe can be constructed as the background idea of many Humean accounts: the argument from motivation. I first present the argument from motivation and explain why it seems so compelling. However, I then develop an equally compellingobjection to desire-based approaches to reason, showing that they cannot accommodate the justificatory role of reasons. I show that this objection suggests that at least one of the premises of the argument from motivation must be false. And, finally, I argue thatwe should reject the premise that claims that only desires can explain actions. This result is fatal for desire-based views of practical reason. My conclusion is that practical reasons should be based not on desires, but on values.