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 proposes that the nature of justice is more readily examined in the state than in the individual, because the larger figure makes visible what the smaller conceals. The city, on this view, has the same three principles that are found in the soul: the rulers correspond to reason, the guardians to spirit, and the producers to appetite. Justice in the state, as 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 analogy is not a mere illustration. Plato holds that there appear to be as many forms of the soul as there are distinct forms of the state, so that the constitution of the city and the constitution of the person are mutually explanatory.
The draws from this principle certain institutions that have long been noted for their severity: the common ownership of property and families among the guardians, the rule of those who know rather than those who merely hold office, and the regulation of poetry and music. These proposals are not offered as concessions to expediency. If the state is to be just in the full sense, it must be governed by knowledge rather than opinion, and every institution must be ordered to the rational whole. The happiness sought is not the disproportionate happiness of any one class, but the greatest happiness of the city as a whole. Whether this places the good of the community above the good of its members, or rather finds the individual's good only in a well-ordered whole, remains a point of dispute in the later tradition.
In the , Plato softens these requirements. The best practicable state relies on written law rather than on philosopher-kings, because human beings as they are cannot be trusted to rule without fixed constraints. The purpose, however, is not abandoned. Political life is still ordered so that it cultivates virtue in the citizens. The question of the state's end, whether it exists for the happiness of individuals or whether individuals exist for the good of the whole, is thus already open in Plato, and is taken up under the ideas of Justice, Citizen, and Government.
"Until philosophers are kings, or the kings and princes of this world have the spirit and power of philosophy ... cities will never have rest from their evils."
"Their country being their mother and also their nurse, they are bound to advise for her good, and to defend her against attacks, and her citizens they are to regard as children of the earth and their own brothers."
Plato opens questions on which much of the later debate proceeds. Aristotle will accept the analogy of whole and part but will deny that the state must be constructed as a magnified soul. Augustine will ask whether any earthly city can achieve the justice that Plato demands. The moderns will reverse the priority and treat the state as an instrument for securing the rights or interests of individuals rather than as the larger image of the soul.
Key work: Republic