The Timpson Lyceum · History of Philosophy (2024)

Plato's Politics – Lecture 20 (History of Philosophy)

Overview

Plato's politics, drawn almost entirely from the Republic, applies his psychology to the state: the ideal city is "one man writ large," built on the same tripartite structure as the soul. Because human beings are unequal reflections of the Form of Manhood, three natural types emerge — those ruled by reason (natural philosophers), by spirit (natural soldiers), and by appetite (the productive masses). Justice in the city, exactly as in the soul, is each part performing its own proper function: the philosopher-Guardians rule, the Auxiliaries (soldiers) enforce, and the Producers supply material needs, all in harmony. Plato defends this with the Myth of the Metals (a "noble lie" of gold, silver, and bronze souls, tested individually and not strictly hereditary), a demanding decades-long education program, and, for the Guardian class, the abolition of private property and family in favor of communal living and controlled reproduction.

The lecture also lays out Plato's collectivism — only the universal Form is fully real, so the collective, not the individual, is the unit of value — and his celebrated account of political decline. No good state lasts; Plato's ideal aristocracy degenerates through timocracy, oligarchy, democracy, and finally tyranny, each stage driven by a specific corruption of value. This decay sequence, together with the Book IX proof that the philosopher-king lives 729 times more pleasantly than the tyrant, completes Plato's argument that the just life is also the happiest — and it deeply influenced later constitutional thought, including the American framers' fear of unchecked democracy.

Key Concepts

• The city as the soul writ large — The state has the same three-part structure as the individual soul; studying justice in the city illuminates justice in the person, and vice versa.
• The three classes — Guardians/Rulers (dominant logos, the philosophers), Auxiliaries (dominant thymos, the soldiers), and Producers (dominant epithymia, the farmers, artisans, and merchants who form the majority).
• Justice in the state — Achieved when each class performs the work suited to its nature and no other: rulers rule, soldiers defend, producers produce. For a ruler to grasp at wealth, or a producer to seize political power, is injustice.
• The other civic virtues — Wisdom resides in the Guardians (good laws and judgment); courage in the Auxiliaries (holding to reasoned command amid danger); temperance in the whole, as the shared agreement that reason should rule and the masses' willing restraint of appetite.
• Equality of the sexes — By nature there is no relevant difference between men and women for civic roles; though on average one sex may excel at a task, exceptional members of the other exist, so no pursuit — including guardianship — is barred by sex.
• The Myth of the Metals (noble lie) — A founding fiction that citizens are born with gold, silver, or bronze/iron souls, justifying the class division. Crucially it is a meritocracy, not a hereditary aristocracy: each child is tested individually, and gold parents may produce a bronze child or vice versa.
• Philosopher-kings — Only those who know the Form of the Good know what is truly good, so only they are fit to legislate and judge. Politics is the most specialized art of all; giving everyone a political voice is as absurd as putting medicine to a popular vote.
• Guardian austerity: no property, no private family — Rulers and soldiers live communally, barred from private wealth (their souls already possess "gold and silver"), eating and sleeping together and supported by the producers. Wives and children are held in common; controlled breeding (rigged "marriage lotteries" pairing the best with the best) aims to reproduce the rare Guardian nature, and shared parentage manufactures one large "family" bound by mutual loyalty.
• Education — The state's central instrument. Early training balances music (arts of the Muses — myths and songs that instill virtue, heavily censored) and gymnastics (body, diet, courage, and temperance). Guardian training then runs through mathematics, geometry, astronomy (motion of bodies), harmonics, and finally five years of dialectic, followed by fifteen years of practical office, so that only at fifty does one rule and, between terms, return to philosophy.
• Collectivism — Since only the universal Form is fully real and the particular is a mere shadow, the collective is the true unit of value. The state should function like a single body — all sharing the same pains and pleasures — and the individual may be sacrificed for the whole, laying (though Plato did not push it there) the philosophical groundwork for later communism.
• Common vs. private feeling — A state is unified when its citizens apply "mine" and "not mine" to the same things; the deepest source of civic discord is divided private interest, which is why Plato's ideal (beyond the practicable Guardian version) is complete communism.
• The five regimes and their decline — In descending order of justice and happiness: aristocracy (rule of the best) → timocracy (rule of honor/spirit, like Sparta) → oligarchy (rule of the wealthy) → democracy (rule of all, prizing equality and license) → tyranny (rule by one strongman, the most unjust). Each decays into the next as its governing value corrupts.
• The engine of decay — Timocracy arises when Guardians fail and honor-loving soldiers seize power; oligarchy when wealth displaces honor; democracy when the resentful poor overthrow the rich and enthrone equality and freedom; tyranny when democratic chaos produces a "protector of the people" who wins a bodyguard, destroys the wealthy, and makes himself absolute master.

Worked Example

Book IX: how much happier is the philosopher-king than the tyrant? Plato closes the Republic by putting a number on the superiority of the just life, deriving the famous figure of 729.

1. Rank the souls. Arrange the regime-types (and their corresponding human characters) from most to least just: $\text{king (aristocrat)} \to \text{timocrat} \to \text{oligarch} \to \text{democrat} \to \text{tyrant}.$

2. Measure the separation. Counting the removes of the tyrant from the true, kingly pleasure through the intervening phantom pleasures, Plato fixes the base interval at $n = 3.$

3. Pleasure is a "solid." True pleasure, Plato argues, is not a mere line or surface but a full three-dimensional magnitude — a solid. To express the interval correctly it must therefore be raised through the dimensions rather than left as a bare length. Treating $n=3$ as length, the plane (square) number is $3^2 = 9,$ and the solid (cube) number is $3^3 = 27.$

4. Combine the two triadic removes. The tyrant is thrice removed in reality from the king, and his pleasure is itself a phantom thrice removed from the true — two triadic separations compounded across the solid measure. Squaring the solid number captures the doubled interval: $(3^3)^2 = 27^2 = 729.$

5. Verify the identity every way. The single number is reached by several equivalent routes, which is part of its appeal to Plato: $729 = 3^6 = (3^2)^3 = 9^3 = (3^3)^2 = 27^2.$

6. State the result. The just philosopher-king lives $729 \text{ times}$ more pleasantly than the tyrant, who by the same interval lives that many times more painfully.

7. The cosmic flourish. Plato notes the number nearly matches the count of days and nights in a year, $365 + 364 = 729$, tying the measure of a well-lived life to the very measure of time — a fitting close to the argument that justice, not tyranny, is the happiest condition. $\blacksquare$

Summary

• Plato's ideal state mirrors the tripartite soul: Guardians (reason) rule, Auxiliaries (spirit) defend, Producers (appetite) supply — and justice is each class doing only its own proper work.
• The class order is justified by the Myth of the Metals as a tested meritocracy (not hereditary), with sex equality of roles, a demanding lifelong education, and, for the Guardians, no private property or family plus controlled breeding.
• Plato's collectivism holds that only the universal is fully real, so the state should act as one body and the individual may be subordinated to the whole — the seed of later communism.
• Every regime decays: aristocracy → timocracy → oligarchy → democracy → tyranny, each driven by the corruption of its ruling value, with tyranny the most unjust and most miserable.
• Book IX crowns the argument with a number: the philosopher-king lives 729 times ($3^6 = 27^2$) more pleasantly than the tyrant — a final proof that the just life is the happiest.