Abstract
In this paper, we argue that the Epicurean genealogy of justice and laws presuppose an analysis of the just as a modality of the useful, an approach that denies the conventional character of justice. This genealogical pattern differentiates the origin of justice from that of the law and refers to friendship as a relevant explanatory factor of the origin of justice. We maintain that the interpretations that underline the incoherence of this reference to friendship, in the framework of a hedonistic theory, presuppose a non-Epicurean sharp distinction between altruism and selfishness.