Plato's Sophist: Non-Being and False Statement

Imagine a consultant telling a client, "This system has passed the safety review." The system exists. The review exists. The sentence is easy to understand. But suppose the review has never been completed. The consultant has made a false assertion by joining familiar things in a way that misrepresents their relationship. Calling the sentence meaningless would miss what makes it dangerous: someone can understand it, believe it, and act on it.

This is a modern illustration of the difficulty Plato examines in the Sophist. How can a statement say what is not the case without becoming speech about nothing? The question sounds abstract until someone tries to use it to make error impossible. If every meaningful statement must concern what is, and falsehood concerns what is not, perhaps there cannot be meaningful false statements at all. A theory that reaches that conclusion needs to explain the ordinary mistakes it appears to eliminate.

Plato approaches the problem through a search for the sophist, a figure who appears knowledgeable without possessing the knowledge he displays. Defining that figure requires an account of appearances and deception. The search consequently becomes an inquiry into being, difference, and the structure of statements. Its useful lesson is precise: an assertion can fail because of what it says about its subject, even when its subject is perfectly real.

At the beginning of the dialogue, Socrates asks how the sophist, statesman, and philosopher differ. These are the objects of inquiry, rather than three identified professionals taking turns in the conversation. The principal discussion proceeds between Theaetetus and an unnamed visitor from Elea, introduced as associated with Parmenides and Zeno. Socrates initiates the question but does not conduct the main investigation (Sophist 216a–218b).

The visitor insists that sharing a name does not establish that two people understand the same thing. They need an account of what the sophist is. Before attempting this difficult definition, they practise on the angler. Starting from the broad category of expertise, they distinguish productive activities from acquisitive ones, then follow narrower divisions until they identify the angler's particular way of catching fish. The exercise makes a definition answerable to explicit distinctions rather than an impression (Sophist 218b–221c).

Applied to the sophist, the method produces several descriptions. He appears as a paid hunter of wealthy young people, a trader in teachings, and a competitive disputant. Another route describes someone who removes a person's conceit of knowledge through refutation. The visitor handles this last comparison cautiously: the beneficial practice of intellectual purification must not be confused too quickly with its deceptive relative. His comparison between a dog and a wolf warns that resemblance can conceal a consequential difference (Sophist 230b–231b).

This creates an objection to the method itself. A classification can reflect the classifier's suspicion. Calling a teacher a hunter already encourages us to picture the student as prey. As readers, we should ask what each proposed description establishes and what it merely suggests. The dialogue's repeated definitions make that question possible; a single memorable insult would not do the same work.

The investigation eventually concentrates on apparent expertise. Someone who seems able to dispute successfully about everything need not know everything. The visitor compares this display with a painter's capacity to produce images of many things without producing those things themselves. A verbal imitation of expertise can likewise impress an audience that lacks the relevant knowledge (Sophist 232b–234e).

The visitor distinguishes likeness-making from the production of misleading appearances. In his artistic example, a likeness preserves the proportions of its original. A large work can instead alter proportions to produce the desired appearance from a spectator's particular viewpoint. The distinction concerns fidelity to the thing represented and the effect on the observer (Sophist 235d–236c).

A map provides a contemporary analogy. A map can simplify a city while preserving the relationships it promises to show. Another diagram might place two locations deceptively close together to influence a buyer. Both are representations, and neither is the city itself. We still need a further account of which features the representation preserves and which judgments it encourages. An image's being different from its original does not automatically make it deceptive.

The metaphysical difficulty arises when the visitor asks what an image is. An image exists, but it is not the original it represents. If every use of "is not" invokes absolute nonexistence, even describing an image becomes troublesome. It seems both to be, as an image, and not to be, as the original. Treating these claims as contradictory would prevent us from stating an ordinary distinction (Sophist 239d–240c).

The visitor invokes Parmenides' prohibition against pursuing what is not. At this stage, the prohibition threatens the account of false opinion as well: how can someone think or say what is not? The discussion exposes further trouble in speaking about absolute non-being. Describing it as one thing, or several things, already appears to give it number and some character (Sophist 237a–239c).

We should keep the attribution within its limits. Plato's visitor is developing and testing an Eleatic difficulty in a dramatic argument. That does not license putting a modern theory of fictional names into the historical Parmenides' mouth. Nor does the Sophist settle every question about sentences concerning nonexistent objects. Its eventual example of falsehood deliberately concerns an available subject: Theaetetus himself.

At 241d the visitor asks not to be regarded as committing parricide when he tests the argument of his intellectual father, Parmenides. The proposed challenge is qualified: what is not must in some respect be, and what is must in some respect not be. The qualification points toward different respects of predication. It does not announce that contradictions are now acceptable. The dialogue's complete text lets us follow the difficulty into its proposed resolution.

Before resolving non-being, the visitor examines competing accounts of being. He stages a disagreement between those who recognize only bodily things and defenders of intelligible, stable realities. Against a narrow bodily criterion, he proposes considering whatever has the capacity to act or be acted upon. This proposal introduces a test of being through power or capacity, but it occurs within an evolving argument, not as an isolated formula that settles the dialogue (Sophist 246a–248a).

The discussion also resists making the whole of reality motionless or treating everything as changing without qualification. Understanding needs an account that can accommodate movement and stability. Yet saying that motion and rest both are already shows that being cannot simply mean either motion or rest (Sophist 248a–250d).

The visitor then considers three possibilities about the combination of kinds. Perhaps no kind combines with another. Perhaps every kind combines with every other. Or perhaps some combine and some do not. Total separation would prevent even motion and rest from participating in being. Universal combination would allow motion itself to become rest. The argument therefore selects a discriminating account of combination (Sophist 251d–252e).

The visitor compares the required discrimination with knowing which letters can be joined. Understanding a language involves more than owning its alphabet. Correspondingly, understanding kinds involves recognizing their permitted relationships. The dialogue calls this philosophical expertise dialectic, connecting the ability to divide kinds with the ability to understand their combinations (Sophist 253a–e).

Motion and rest are distinct, yet each participates in being. Each is also the same as itself and different from the others. Being cannot be identical with Sameness: otherwise, admitting that motion and rest both are would make them the same. Difference likewise needs separate treatment, especially because being different is always being different from something (Sophist 254b–255e).

The distinction between identity and participation does substantial work here. If motion participates in being, it does not follow that motion is identical with Being. If it participates in Sameness, it is the same as itself; this does not make it identical with Sameness itself. Without attention to these different relations, the vocabulary can create the contradictions that the argument is trying to avoid.

The visitor's central move is to understand a relevant sense of non-being through difference. Motion is not rest, although motion exists. Motion is also different from Being itself, although it participates in being. Saying that it "is not" in one respect need not cancel the respect in which it is (Sophist 256a–257a).

This can be confusing because the same words perform different jobs. "Motion is not Being itself" denies an identity. "Motion is" attributes being to motion. The first proposition does not contradict the second. A book can similarly exist without being identical with existence, though that ordinary illustration does not establish Plato's metaphysical account of participation.

At 257b–c, the visitor explains that a negative need not signify the contrary of what follows it. Something not large might be small, but it might also be equal in size to the comparison object. The negative leaves more than one possibility available. It distinguishes the thing from the character denied without forcing it into one particular opposite.

A contemporary example is a report that calls a proposal "not approved." That leaves open whether it was rejected, deferred, or never considered. Replacing the phrase with "rejected" adds information the negative alone does not supply. The example illustrates the logical caution; Plato is discussing large, equal, and small, not administrative decisions.

Still, the slogan "not means different" needs care. Suppose someone says, "Theaetetus is not wise." It would be inadequate to explain this merely by observing that Theaetetus is not numerically identical with Wisdom. A wise person would also differ from Wisdom itself. An account of predication must concern whether a character applies to its subject, rather than confusing that question with the identity of two objects.

This is why the earlier discussion of combination matters. Difference allows the visitor to articulate exclusions within what is. It does not make every arbitrary difference an adequate explanation of every negative statement. The argument concerns structured relations among kinds and their applications, not a license to replace all negatives mechanically with a single phrase. Reading 254b–259e alongside the later account of discourse at 261d–264b helps keep these relations distinct.

The visitor now examines discourse. A string of names alone does not make an assertion. Nor does a string of verbs. A basic statement joins a name with a verb so that something is said about something. The point is not simply grammatical correctness: the combination introduces an assertion about a subject (Sophist 261d–262e).

The dialogue contrasts a statement that Theaetetus is sitting with one that Theaetetus is flying. The sitting statement is true in the conversation's situation; the flying statement is false. Both are about Theaetetus. The second attributes to him something that is not so about him, presenting it as if it were so (Sophist 263a–d).

Nothing here requires a mysterious nonexistent object called falsehood. The subject is available, the activity can be spoken about, and the predication misrepresents the subject. Difference and combination make it possible to explain an intelligible error. The false assertion has not disappeared merely because it fails to match its subject.

Return to the consultant's safety claim. A completed review may be a perfectly intelligible condition without applying to this system. Establishing that reviews exist somewhere does not validate the assertion. Nor does establishing that the system exists. We must investigate the particular relationship asserted. This is the practical difference between understanding a sentence and knowing that it is true.

The visitor extends the account to thought, opinion, and appearance. He describes thought as an unspoken dialogue of the soul with itself, and connects opinion with an affirmation or denial reached in thinking. Their relationship to discourse makes room for falsity in them too (Sophist 263e–264b). These are philosophical accounts within the dialogue; the passage does not offer an experimental theory of cognition.

The possibility of falsehood also permits the inquiry into the sophist to resume. The closing divisions distinguish imitation based on knowledge from imitation based on opinion, and naive confidence from the dissembling of someone who suspects his ignorance. The final route identifies the sophist with an opinion-based, dissembling verbal imitation that produces contradictions in private questioning (Sophist 264c–268d). It is more specific than a definition of anyone who ever says something false.

A reasonable objection is that redefining non-being has not refuted every possible Eleatic concern. If Parmenides' prohibition concerns absolute nothingness, showing that motion differs from rest need not make absolute nothingness thinkable. The visitor's success can instead be assessed against the problem he needs to solve: articulating difference, negative predication, and false discourse without collapsing them into sheer nothing.

Another objection concerns the move from metaphysics to language. An account of how kinds combine does not by itself provide evidence about whether a particular claim is true. The argument about Theaetetus relies on what he is actually doing. A metaphysical possibility of false assertion cannot replace observation or testimony when judging an assertion. In the consultant example, someone still needs the review record.

A third limit concerns fiction and empty names. Because the dialogue's decisive example uses an existing subject, its explanation should not be advertised as a complete solution to every statement about a fictional city or an impossible object. Such questions can be compared with the Sophist, but the comparison introduces further problems. We should not silently treat them as resolved by the sitting and flying example.

These limits make the contemporary applications more useful. In a hypothetical software report, an invented result can be meaningful enough to deceive even if its asserted success never occurred. In a disagreement with a friend, denying one accusation does not establish every positive description of one's conduct. In both cases, we can identify the subject, specify what was asserted, and ask which evidence bears on that assertion. These are applications of the distinctions, not predictions Plato made about our institutions or technology.

The dialogue also gives readers a way to assess apparent expertise. The ability to answer every question fluently can be separated from knowledge of the subject. That distinction does not prove that a confident speaker is a sophist. It directs attention to whether the person can explain the relationships they assert and respond to relevant corrections. Our own classifications deserve the same scrutiny.

The Sophist connects the work of defining with the work of asserting. We distinguish kinds to understand what something is; we investigate their relations to understand what can be said about it. A false sentence can use the same familiar words as a true one. The difference lies in what it asserts about its subject, and that is where an inquiry into its truth must continue.

• Plato, Sophist, translated by Benjamin Jowett. Read the dialogue separately from the translator's introduction; 251d–264b contains the central argument discussed here.
• Within the Sophist, compare 254b–259e on the selected kinds with 261d–264b on statements. Following both stretches keeps the metaphysical and linguistic questions connected.
• Plato, Theaetetus, especially 187d–200d, for another sustained discussion of false judgment.
• Plato, Statesman, for a related investigation that continues the practice of division and tests its use in defining expertise.