The problem of self-deception lies at the heart of Nietzsche's account of the slave revolt in morality in the first essay of On the Genealogy of Morals. The viability of Nietzsche's genealogy of morality is thus crucially dependent on a successful explanation of the self-deception the slaves of the first essay are caught in. But the phenomenon of self-deception is notoriously puzzling. In this paper, after critically examining existing interpretations of the slaves’ self-deception, I provide, by drawing on Alfred Mele's (...) work on self-deception, a deflationary account of the slaves’ self-deception; an account which explains the slaves’ self-deceived predicament but without either the attribution of contradictory mental states or an intention to produce or to facilitate the production of the belief the self-deceived subjects end up holding. In light of my account of self-deception, I interpret Nietzsche's intriguing claim that the slaves’ revaluation of ressentiment amounts to their ‘most mendacious artistic.. (shrink)