Following Lawrence Kohlberg it has been commonplace to regard Plato's moral theory as ‘intellectualist’, where Plato supposedly believes that becoming virtuous requires nothing other than ‘philosophical knowledge or intuition of the ideal form of the good’. This is a radical misunderstanding of Plato's educational programme, however. While Plato claims that knowledge is extremely important in the initial stages of the moral development of young adults, he also claims that knowledge must be followed by a rigorous process of imitation and habituation. Like Aristotle, Plato believes that it is not possible to become virtuous if one does not practice the virtues under the guidance of virtuous role models. This paper seeks to illuminate this little recognised aspect of Plato's educational programme. When properly understood, Plato's theory offers educators important insights into how best to encourage the moral development of young adults.