Plato
428–348 BC · Ancient Greek
The state is the soul writ large; a just polity mirrors the rational ordering of the just person.
Plato constructs the state as an analogy. The city has the same three parts as the soul: rulers correspond to reason, guardians to spirit, and producers to appetite. Justice in the state, like justice in the soul, is the condition in which each part performs its proper function and does not meddle with the others. The philosopher-kings rule because they alone have knowledge of the Good; the guardians enforce their decisions; the producers supply material needs.
The is famous for its radical proposals: communal property and families among the guardians, the rule of philosophers, the censorship of art. These are not concessions to practicality but consequences of principle. If the state is to be truly just, it must be governed by knowledge, not opinion, and every institution must serve the rational order. The ideal city is a thought experiment about what would follow if political life were fully rational.
In the , Plato softens these proposals. The best practicable state relies on law rather than philosopher-kings, because actual human beings cannot be trusted to rule without written constraints. But the purpose remains the same: to order political life so that it cultivates virtue in the citizens.
"Until philosophers rule as kings or those who are now called kings genuinely and adequately philosophize, cities will have no rest from evils."
"The myth of the earthborn men teaches that citizens are brothers born from the same earth."
Plato establishes the central question: does the state exist for the sake of individual happiness, or do individuals exist for the sake of the state? Aristotle will accept the second option; the moderns will insist on the first.
Key work: Republic