  But there are other ways in which mathematical learning and knowledge of forms might affect one’s motivations. Socrates suggests one way  when he says that a philosopher will aspire to imitate the harmony  among the forms (500b–d). Some scholars have understood Socrates to  be saying that philosophers will desire to reproduce this order by  cultivating more order and virtue in the world, as Diotima suggests  in the Symposium (Irwin 1995, 298–317; cf. Waterlow 1972–1973, Cooper 1977, Kraut 1991). On this reading, knowledge of the forms  motivates just actions that help other people, which helps to solve  the standing worry about the relation between psychological justice  and practical justice.