This paper outIines an account of rational action. It distinguishes three species of reasons: motivating reasons, evidential reasons, and normative reasons. It also contends that there is a univocal notion of reason common to the notions of motivating reasons, evidential reasons, and normative reasons. Given this thesis, the paper explains how we can have a unified theory of reasons for action. It also explains the role of values in rational action. It sketches an affective approach to value that contrasts with prominent desire-satisfaction approaches.