Plato on Knowledge vs. True Opinion

Hello! Welcome to our final lesson on Socrates and the early dialogues of Plato.

In our last lesson, we saw Socrates in the Crito use reasoned argument to conclude that he must accept his death sentence, choosing to uphold his principles over his own life. He acted on beliefs he held to be just. But this raises a crucial question that his own method invites: How can we be sure that our deeply held beliefs are not just strong opinions, but actual knowledge? What is the difference between simply being right by chance, and knowing you are right?

This is one of the most fundamental questions in philosophy, and it's the focus of our lesson today. We will explore it as it emerges in another of Plato's early dialogues, the Meno.

Our learning outcome is to explain the distinction between knowledge and true opinion as it emerges in Plato's early dialogues. We'll see how a puzzle about learning leads Socrates to a groundbreaking definition of what it means to truly know something.

The Challenge to Inquiry: Meno's Paradox

The dialogue Meno begins with a seemingly straightforward question: "Can virtue be taught?" True to form, Socrates insists they cannot answer this until they first know what virtue is. As they struggle to find a definition, Meno, a wealthy young aristocrat, voices a clever and frustrating puzzle that challenges the very possibility of inquiry. This is now known as Meno's Paradox.

The following video will introduce the paradox and Socrates' surprising response.

To summarize the paradox:

• If you know what you're looking for, inquiry is unnecessary.
• If you don't know what you're looking for, you won't know how to search for it or even recognize it if you find it.
• Therefore, inquiry is impossible.

Socrates' solution is the theory of recollection (or anamnesis). He proposes that the soul is immortal and has learned everything in past existences. What we call "learning" is simply the process of "recollecting" this innate knowledge that we have forgotten.

"Recollecting" True Opinions: The Slave Boy

To prove his point, Socrates performs one of the most famous experiments in philosophy. He calls over one of Meno's slave boys, who has had no education in mathematics, and, by only asking questions, guides him to solve a geometry problem.

Let's turn to the primary text to see how this unfolds. This is a masterful demonstration of the Socratic method in action.

After the demonstration, Socrates gets Meno to agree that the boy, without being taught, has come to have true opinions (doxa orthē) about geometry. However, Socrates is clear that these opinions are not yet knowledge. This sets the stage for the crucial distinction.

The Runaway Statues: True Opinion vs. Knowledge

If true opinion is sufficient to guide us correctly—as it did for the slave boy—why do we prize knowledge so much more highly? Socrates uses a practical example to explore this puzzle.

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    "instructions": "Watch from 9:39 to 14:56. The video explains that true belief can be just as useful as knowledge in a given moment. The key difference, as Socrates argues, lies in its stability. Focus on the analogy of Daedalus's statues and the concept of 'tying down' a belief with a reason.",
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As the video explains, a person with a true opinion about the road to Larissa will get there just as successfully as a person with knowledge of the road. But there's a problem with true opinions.

Socrates compares them to the mythical statues made by Daedalus, which were so realistic they would run away if not tied down. True opinions are like that: they are valuable, but they are "not willing to remain long, and they escape from a man’s mind."

Knowledge, by contrast, is a true opinion that has been tied down.

How do we tie them down? Let's read the original passage where Socrates gives his famous answer. As the scholar Gail Fine notes, this passage is likely the first time in Western philosophy that an explicit analysis of knowledge is offered.

So, here is the formula that emerges:

Knowledge = True Opinion + an Account of the Reason Why

This "account" (logos) is what provides the justification for the belief, making it stable and secure. It's the answer to the "why?" question. The process of Socratic questioning, of working through arguments as we saw with the slave boy, is the method for arriving at this account. A person with knowledge doesn't just hold a correct belief; they understand why it is correct and can defend it with reason.

This is why the great statesmen of Athens, according to Socrates, were unable to teach virtue. They may have governed well, acting on true opinions given to them by "divine inspiration," but they didn't have knowledge. They couldn't give an account of why their actions were virtuous, and thus couldn't pass that ability on to their sons.

Conclusion and A Glimpse Ahead

Today we have unearthed a foundational distinction in philosophy. We've seen that for Plato, in the Socratic dialogues:

• True Opinion (doxa orthē) is a correct belief about something. It is useful for guiding action but is unstable and can be easily lost, like a "runaway statue."
• Knowledge (epistēmē) is a true opinion that has been "tied down" by an "account of the reason why." This justification makes the belief stable, secure, and something the knower can explain and defend.

This distinction between the realms of opinion and knowledge is not just a clever point made in the Meno. It becomes a cornerstone of Plato's entire mature philosophy. He will develop this idea into a comprehensive vision of reality, where the changing, physical world we perceive with our senses is the realm of opinion, while the eternal, unchanging, intelligible world of the Forms is the realm of true knowledge.

This famous image, the Analogy of the Divided Line from Plato's Republic, provides a map of this two-world view.

As you can see, Belief (pistis) and Imagining (eikasia) are placed in the lower world of appearances—the realm of opinion. True Knowledge (epistēmē or noēsis) and Thinking (dianoia) are reserved for the higher, intelligible world of the Forms.

The journey from the lower part of the line to the top—from unstable opinion to stable knowledge—is the journey of the philosopher.

In our next module, we will begin that journey, moving from Plato's early Socratic dialogues to the grand metaphysical theories of his middle period. We will explore the Theory of Forms, which provides the ultimate "account of the reason why" for all knowledge, starting with his beautiful Analogy of the Sun.