But Plato was also concerned, like his teacher Socrates, with the nature of how we should be ruled. There will be no end to the troubles of states or indeed of humanity itself till philosophers become rulers in this world or till those we now call kings and rulers really and truly become philosophers and political power and philosophy thus come into the same hands. So like Socrates, he's wary of how they have been governed. And remember, we're now after the period of the Peloponnesian War. The city-states of Greece, especially Athens, have been dramatically weakened. So a lot of people might be thinking, including Plato, well, is there a better way to govern ourselves? Well, now Plato's most famous student is Aristotle.