YaleCoursesEducation in the Healthy City - Purposes of College Education, Lecture 4
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Setting Up Book Two's Question 0:00
The topic is why one should be just, picking up from the end of Book One of Plato's Republic, where Socrates rejected four attempts to define justice but admitted he still did not know what justice actually is. Book Two opens with a harder challenge from two of Plato's brothers, Glaucon and Adeimantus, who ask not what justice is but why anyone should want to be just. The focus for this session is the first twenty pages or so of Book Two, especially Glaucon's story of the Ring of Gyges and the nature of rewards for justice, before Socrates shifts the conversation from justice in the individual to justice in the city, since the whole book is ultimately about political justice as much as personal justice.
Four Rejected Views From Book One 4:02
Before moving forward, the four earlier definitions of justice are reviewed. Cephalus, the elderly host, offered the conventional view that justice means speaking the truth and giving back what you have taken. His son Polemarchus added the idea of helping friends and harming enemies, a kind of retributive justice quite different from the golden rule, which barely appears in classical philosophy. Thrasymachus, backed by the politician Cleitophon, argued that justice is simply whatever the stronger party or the ruling law says it is. Finally, a frustrated Thrasymachus claimed justice is foolish, that the just man always has less than the unjust man, making him the voice of moral skepticism. None of these four are treated as equally weak, but all are judged insufficient, setting up Socrates's task for the rest of the work: to build a positive, defensible account of justice.
Three Kinds of Good 7:39
Glaucon opens Book Two by asking what kind of good justice is, sorting goods into three categories: things good purely for their own sake, like the harmless pleasure of eating chocolate cake, things good both for their own sake and for their results, like thinking, seeing, or health, and things good only for their consequences, like medicine or a visit to the dentist, which nobody enjoys but everyone accepts as necessary. Socrates wants to argue justice belongs in the middle category, good in itself and good for what it produces.
Kant Versus Utilitarianism 9:33
This three-part scheme is used to introduce two later strands of modern moral philosophy. Deontology, associated with Kant and the idea of duty, holds that right action is done purely because it is required, regardless of whether it brings pleasure or reward, a view linked to Protestant Christian ethics and to the golden rule's idea of doing good without regard to consequence. Consequentialism, associated with John Stuart Mill and Jeremy Bentham's utilitarianism, judges actions by their outcomes, aiming for the greatest happiness for the greatest number, illustrated by dilemmas like whether one would kill Hitler to save a million lives. Plato's position differs from both, treating justice as good in itself and for its consequences, which shifts the emphasis toward the character and virtue of the person acting rather than judging isolated acts by rule or outcome alone.
The Ring of Gyges 15:03
Glaucon then retells the legend of Gyges, a shepherd in Lydia who, after an earthquake opens a chasm, finds a corpse wearing a golden ring that makes him invisible when turned inward and visible when turned outward. Using this power, he becomes a messenger to the king, commits adultery with the king's wife, kills the king with her help, and seizes the throne. Glaucon draws from this story the conclusion that everyone would act unjustly if they could get away with it.
The Ring of Invisibility Thought Experiment 16:03
The lecture returns to Glaucon's story of a ring that grants invisibility, noting its echo in Tolkien's Lord of the Rings, where the ring corrupts nearly everyone who holds it, from kings down to Gollum, and only Frodo and Sam manage to resist its pull long enough to destroy it. Glaucon uses this image to ask whether anyone would still act justly if they could get away with injustice, contrasting a perfectly unjust man who keeps a flawless reputation for justice with a truly just man who is stripped of all reputation and still does right, a situation compared to the biblical Job. The point of the exercise is to separate justice itself from the rewards that usually come with seeming just.
Adeimantus and the Reward Question 19:05
Adeimantus extends his brother's challenge by arguing that people, and especially fathers advising their children, praise justice only for the reputation and rewards it brings, such as good marriages and public offices, not for its own sake, quoting Simonides that seeming can overpower truth itself. Both brothers press Socrates to show that justice benefits a person even without recognition from gods or people, and to explain what intrinsic reward justice might offer. The lecturer poses this as a question for you to consider, asking whether justice is upheld for supernatural reasons, social convenience, a Kantian sense of universal duty, illustrated by the everyday example of clearing your own table at McDonald's, or something else entirely, noting that Socrates does not answer directly but instead shifts the discussion toward the city.
Building the Smallest Possible City 22:30
Socrates turns from the individual to the city, arguing that division of labor is necessary for any city to function, a claim the lecturer links to later debates from Rousseau, Marx, and Durkheim about whether specialized labor is the root of social inequality. You are asked to imagine the smallest city that could meet basic needs, and after a class poll on how few jobs might suffice, the lecturer reveals Plato's answer: farmers, housebuilders, weavers, and shoemakers form the healthy city's core. The class then suggests further roles, including sanitation workers, toolmakers, doctors, judges, teachers, and merchants, before the lecturer describes how Plato worries the city becomes feverish and overgrown once luxury professions like poets, actors, wet nurses, beauticians, and relish makers are added, moving it away from the simple, farmer-dominated town toward a more complex, layered society.
Guardians and the Threat of War 32:35
Plato worries about who will protect a growing city, both from internal theft and from neighboring city-states. Writing as a Greek amid constant war between cities like Athens and Sparta, he notes that citizens were expected to fight, whether as rowers in the navy or as hoplites carrying sword and shield. This concern leads him to introduce the guardians, who split into two groups: the auxiliaries, who serve as soldiers, and the guardians proper, who act as rulers and judges.
Ambition, Corruption, and Coordination 34:00
You get a biblical parallel here in the Tower of Babel story from Genesis, illustrated by Bruegel's 1563 painting, where humans building a city toward heaven are scattered into different languages and can no longer cooperate. Like Plato's feverish city, the story raises the danger of human ambition, wanting more than simple farm life, relish on pork, better tools, songs and dances, which breeds specialization and corruption. It also raises the problem of coordination, since factions, like a shoemakers union fighting leatherworkers, can tear a city apart, while constant war with neighboring cities forces a permanent warlike posture.
Training the Guardians 37:37
The guardians need, in Plato's words, the nature of a noble puppy, trained in gymnastic for the body and music for the soul, since he believes music shapes character rather than being mere decoration. This leads him toward character education, echoing Aristotle and Confucius. The puppy comparison brings to mind George Orwell's Animal Farm, where trained dog puppies become a violent secret police for the ruling pigs, raising the question of whether obedient guardians can also have independent judgment.
Poetry, Character, and Yale 42:30
Plato distrusts poetry showing the gods behaving badly, wanting guardians to have good models, a concern that eventually leads him to nearly banish Homer by Book X. The lecture closes by linking this to Yale's own history, noting that Yale College's mission has long aimed at educating leaders of good character, paralleling Plato's concern with educating guardians for a just society.
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