In recent work, Bernard Reginster argues for an interpretation of the relationship between morality and the affects in Nietzsche which he calls ‘sentimental pragmatism’. According to this view, the values, value judgments, and moral practices agents develop and adopt function to serve specific affective needs. Reginster deploys this interpretation to argue for a functional interpretation of Nietzsche’s On the Genealogy of Morality, according to which all three essays of the Genealogy comprise psychological studies designed to uncover Christian morality’s function to (...) serve the affect of ressentiment. In this paper, I first develop Reginster’s sentimental pragmatism by specifying a need to feel powerful as the one affective need which all moral developments aim to serve on Nietzsche’s view. Then, I argue that while Reginster’s functional interpretation of the Genealogy makes sense of key moral phenomena discussed in the first and third essays, it works less well to explain key developments in the second essay. I then suggest that my power-based sentimental pragmatism does better in this regard, allowing us to identify one basic function of morality that Nietzsche intends to uncover in all three essays of the Genealogy, one basic affective need it aims to serve: the need to feel powerful. (shrink)