Abstract

Robust moral rationalism has long been regarded as incompatible with the Humean Theory of Motivation which requires desires to ground motives. Recently this orthodoxy has been challenged on the ground that rationality itself might require certain desires. This strategy does not remove the tension between rationalism and the Humean Theory. If rationalism is correct, new normative beliefs should engender new motives - motives not grounded in a means-ends fashion in rationally required existing desires. Thus the motivational responses we should expect would be ruled out by the Humean Theory, even when supplemented by rationally required desires. Anti-Humeans about rationality should not be Humeans about motivation.