This article examines Plato’s understanding of moderation. I begin with a brief discussion of Plato’s Charmides, the dialogue in which Socrates asks, “What is moderation?” in order to frame a detailed treatment of key passages in Plato’s Republic where we find a definitive answer. I show the progress of the Republic to be an intentional development on Plato’s part, moving readers from a conventional understanding of moderation as mastery to a more compelling ideal: moderation as a harmony of the city (...) and of the soul. Bringing moderation out from under the shadow of justice illuminates the dialogue’s otherwise perplexing presentation of the relationship between these two virtues and helps us to see both the role moderation plays in Plato’s thought, and what his vision might contribute to our own understanding of the virtue. (shrink)