Despite Plato’s repeated criticism of both µῦθοι and mystery cults, Orphism/Pythagoreanism and the Eleusinian Mysteries feature frequently in his dialogues. This paper uncovers the reason why, and the context in which, Plato employs motifs and language associated with these cults. Prevailing explanations in scholarship are shown to apply in some instances but not others, and to be largely insufficient in providing an underlying reason for Plato’s use of mystery cults in general. Through a detailed examination of various mystery motifs in the dialogues, this paper argues that Plato has simply borrowed from religion what he could not achieve with philosophy alone: emotional appeal.