In this episode of Notions of Progress — the first of a two-part examination of Plato — we ask what happens to the Sophists’ theory of progress once Plato is done with it. The Sophists had argued that human beings advance through the accumulation of teachable skill: collectively, cumulatively, and through the civic power of persuasion. Plato systematically dismantled each of those claims. This episode traces the first two dimensions of that dismantling through two of the most consequential passages in the history of Western philosophy.
The first is the Allegory of the Cave (Republic Book VII, 514a–521b). The second is the doctrine of recollection, or anamnesis, introduced through the slave boy demonstration in the Meno (80a–86c). Taken together, these passages make a radical argument: genuine knowledge is not built up from experience, it is recovered from what the soul already contains. Progress, for Plato, is not horizontal accumulation — it is vertical ascent toward the eternal Forms, an ascent that is individual, not collective, and philosophical, not technical.
Drawing on W.K.C. Guthrie’s A History of Greek Philosophy, Julia Annas’s An Introduction to Plato’s Republic, and David Sedley’s scholarship on the Forms and philosophical education, this episode opens the question of whether Plato’s vision constitutes a theory of progress at all — or something altogether different.
Five Important Terms
• Paideia (pie-DAY-ah): Formation, or the cultivation of the soul. For Plato, paideia is not the transmission of information but the turning of the whole person — their desires, habits, and perceptions — toward the Good. The Cave allegory is, among other things, an account of what genuine paideia requires.
• Anamnesis (ah-nam-NAY-sis): Recollection. Plato’s doctrine, introduced in the Meno, that the soul does not learn new things but recovers what it already knew before birth. If anamnesis is correct, knowledge cannot be transmitted by teachers — it can only be drawn out through the right kind of questioning.
• Eikasia (ay-KAH-see-ah): Image-thinking — the lowest stage of cognition on Plato’s Divided Line. This is the condition of the cave-dwellers: taking shadows for reality, images for originals. For Plato, most people, most of the time, live in eikasia.
• Doxa (DOX-ah): Opinion or belief. The middle range of cognition, where most people who have escaped the cave still remain — aware of the sensible world but not yet in contact with the Forms. Doxa was precisely what the Sophists trained their students to produce and deploy. For Plato, this was the problem.
• Eidos (AY-dos): Form, or the eternal, unchanging pattern that physical things imperfectly imitate. The plural is ‘eide.’ When Plato says the philosopher ascends toward the Good, he means toward the highest of these Forms — the Form of the Good, the sun of the intelligible world.
Major Themes
• Plato’s systematic response to the Sophists, organized across four dimensions: collectivity, cumulativity , teachability and rhetoric (episode 7) as civic engine — and what each reversal means for the idea of progress
• The Allegory of the Cave as a theory of cognitive ascent: the four stages from shadow-watching to encounter with the Form of the Good, and why the ascent is always individual, never collective
• The Meno paradox (‘80a): how can you inquire into what you do not know? And what Plato’s answer — anamnesis — implies about the nature and limits of teaching
• In the Meno: Socrates draws out geometrical knowledge from an uneducated slave boy through questioning alone — what this shows about knowledge, and what it forecloses about cumulative progress
• The Divided Line (Republic 509d–511e) as the epistemological map behind the Cave: the relationship between image-thinking, belief, reasoning, and understanding. More on the divided line to come in episode 7.
• The political cost of philosophical ascent: why the philosopher, having seen the light, is obligated to return to and to rule over the dwellers of the cave — and what this means for Plato’s vision of the just city
Fascinating Historical InsightsThe Death of Socrates and the Birth of Plato’s Philosophy
In 399 BCE, a jury of 501 Athenian citizens voted to execute Socrates on charges of impiety and corrupting the youth. Plato was in his late twenties and is believed to have been present. Almost every major dialogue he wrote afterward can be read, in part, as a response to that verdict. The jury that condemned Socrates was drawn from the citizen body that the Sophists had spent decades educating in the arts of democratic persuasion. Plato’s attack on Sophistic rhetoric — and on the claims of democracy itself — cannot be separated from this biographical wound.
The Meno Paradox and the Problem of Inquiry
At Meno 80a, the character Meno poses what is sometimes called the paradox of inquiry: “How will you look for something when you don’t know at all what it is? … And even if you do happen upon it, how will you know that this is the thing you didn’t know?” This is not a sophistic trick. It is a genuine epistemological puzzle: inquiry seems to require already knowing what you’re looking for. Plato’s answer — that the soul already contains what it seeks, having encountered the Forms before birth — is one of the most ambitious moves in the history of philosophy, and it has direct implications for how he understands progress, pedagogy, and the limits of human teaching.
The Slave Boy Who Already Knew
To demonstrate anamnesis, Socrates calls over Meno’s household slave — a boy with no mathematical training — and asks him a series of questions about the geometry of squares. Without being told anything, guided only by Socrates’s questions, the boy arrives at the correct answer. Socrates’s conclusion is that the knowledge was already there, latent in the soul, waiting to be drawn out. For Plato, this is not a pedagogical technique. It is a metaphysical demonstration: knowledge is not transmitted from teacher to student — it is recovered by the soul from itself.
The Philosopher Who Must Return
The Cave allegory does not end with the philosopher’s liberation. Having made the ascent from shadow to light, the philosopher is compelled to return — back into the cave, back among those who see only shadows, to serve as a ruler of the city. The philosopher does not want to return,but the just city, as Plato conceives it, requires that those who have seen the Good govern those who have not. Progress, in this view, is always asymmetric: a few ascend; the many remain below; and the one who has seen the light must sacrifice the vision to serve the darkness.
Show Notes & Timestamps
00:00 Introduction to Progress and Education
01:18 The Scholarly Guides
01:54 What Episode 5 Established
02:24 Plato's Counter Proposal to the Sophists
04:39 Plato's 4 Pillars
05:32 The Allegory of the Cave: Individual Ascent
05:56 What This Episode Will Cover
07:02 Allegory of the Cave
08:36 The Nature of Knowledge and Ignorance
11:20 The Implications of Plato's Philosophy on Progress
14:56 Against Cumulativity
18:20 Closing
Key Concepts/Terms DiscussedThe Allegory of the Cave (Republic 514a–521b)
Plato’s most famous image of the human cognitive condition. Prisoners chained in a cave see only shadows cast on a wall by objects behind them; they take the shadows for reality. One prisoner is freed, turns to face the light, and eventually ascends out of the cave into the sunlight — where he finally sees the objects themselves, and at last the sun, which Plato identifies with the Form of the Good. Julia Annas emphasizes that the Cave is not merely a metaphor about ignorance and enlightenment: it is a systematic account of the different cognitive levels mapped in the Divided Line, dramatized. For our purposes, the crucial feature is that the ascent is individual: one person makes the climb. There is no collective advance, no institutional accumulation, no transfer of the vision to others. The prisoner who ascends cannot bring the cave-dwellers with him.
The Doctrine of Recollection: Anamnesis (Meno 80a–86c)
Plato’s epistemological theory that the soul is immortal and has encountered the Forms before its birth into a body; what we call ‘learning’ is, strictly speaking, the recovery of this prior knowledge under the prompting of experience and questioning. W.K.C. Guthrie notes that anamnesis is Plato’s answer to the Meno paradox — it resolves the puzzle of how genuine inquiry is possible without already knowing the object of inquiry. But its implications for progress are radical. If knowledge is recovered rather than accumulated, there is no genuine cognitive progress in the historical sense. Each soul must make the recovery for itself. The Sophists’ claim that wisdom can be transmitted and that civilization advances through the accumulation of teachable skills is, on this view, doubly mistaken: it confuses opinion for knowledge, and transmission for genuine education.
The Divided Line (Republic 509d–511e)
Plato’s epistemological schema, introduced just before the Cave, in which he divides the objects of cognition into two main categories — the visible and the intelligible — and subdivides each. The four resulting levels, ascending from lowest to highest, are: eikasia (image-thinking), pistis (belief about visible things), dianoia (hypothetical mathematical reasoning), and noesis (understanding of the Forms themselves). The Cave allegory dramatizes the journey from eikasia toward noesis. Crucially, doxa — opinion, the highest cognitive state the Sophists cultivated and the democratic city depended upon — falls in the lower half of the line, in the realm of the visible and the changeable. For Plato, Sophistic paideia educates people at the wrong level of the divided line.
Resources & Further ReadingPrimary Sources Referenced
• Plato. Republic, Book VI (509d–511e) — The Divided Line
• Plato. Republic, Book VII (514a–521b) — The Allegory of the Cave
• Plato. Meno (80a–86c) — The Meno paradox and the slave boy demonstration
Secondary Scholarship
• Guthrie, W.K.C. A History of Greek Philosophy, Vol. IV: Plato — The Man and His Dialogues: Earlier Period. Cambridge: Cambridge University Press, 1975.
• Annas, Julia. An Introduction to Plato’s Republic. Oxford: Clarendon Press, 1981. (Especially Chapter 10, on the Sun, Line, and Cave.)
• Sedley, David. “Philosophy, the Forms, and the Art of Ruling.” Chapter 10 in The Cambridge Companion to Plato’s Republic, edited by G.R.F. Ferrari. Cambridge: Cambridge University Press, 2007. (p. 256)
• Retz, Tyson. Progress and the Scale of History. Cambridge: Cambridge University Press, 2022. (See Episodes 3–4 of this podcast for Retz’s framework.)
Related Notions of Progress Episodes
• Episodes 5–6: The Sophists — A Fifth-Century Enlightenment? (the theory Plato is responding to)
• Episodes 3–4: Five Faces of Progress — Prof. Tyson Retz (the taxonomic framework against which both the Sophists and Plato are being read)
Coming Soon
Episode 7, Part 2: What Plato Did to It — Teachability, Rhetoric, and the Gorgias.
In Part 2, we complete Plato’s systematic dismantling of the Sophists’ theory of progress. The Meno’s conclusion (87c–100b) revisits the question of whether virtue can be taught — and delivers a verdict that is far more unsettling than it first appears. Then we turn to the Gorgias, where Plato makes his case against rhetoric as a civic engine: that it is not a technê at all but a form of flattery — a practice that produces belief without knowledge, and that corrupts the city by giving people what they want rather than what they need. If the Cave tells us what genuine progress looks like, the Gorgias tells us what its most dangerous counterfeit looks like.
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About Notions of Progress
Notions of Progress examines ideas of technological and human progress from antiquity through contemporary AI debates. Each episode features ideas and insights from scholars and practitioners alike through in-depth conversations and essays. The show explores the intellectual history of progress narratives and the debated meanings of advancement — tracing how different historical periods and thinkers have understood, or rejected, the idea that humanity progresses through time.
Host: Marshall Madow is an independent researcher who holds an MA in History from Cambridge University (thesis on Georges Sorel’s epistemology of myth) and an MSc from Oxford University, Saïd Business School (specialty in Complexity Science and Leadership). His current research interests include understanding progress narratives and technological progress from antiquity to the present.
Contact: [email protected]
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