  After the challenge of Glaucon and Adeimantus, Socrates takes off in  a strange direction (from 367e). He suggests looking for justice as a virtue of cities before defining justice as a virtue of persons, on  the unconvincing grounds that justice in a city is bigger and more  apparent than justice in a person (368c–369b), and this leads  Socrates to a rambling description of some features of a good city  (369b–427c). This may seem puzzling. But Socrates’ indirect approach  is not unmotivated. The arguments of Book One and the challenge of  Glaucon and Adeimantus rule out several more direct routes.