Sophist

Author: Plato · Year: c. 4th c. BCE — one of the stylometrically secure "late" dialogues (Cooper, Intro §II) — (trans. Nicholas P. White, Hackett 1997) · Type: dialogue

The dialogue in which the hunt to define the sophist forces a crisis in ontology — and Plato commits the "patricide of Parmenides." Defining the sophist as a maker of falsehoods and appearances seems to require that "that which is not" in some way is — exactly what Parmenides forbade. To rescue falsehood, the Eleatic Visitor must overturn his own tradition's father, establishing that not-being is the different (to heteron), not the contrary of being. Along the way he maps the five greatest kinds (being, rest, change, same, different) and their selective blending (koinōnia tōn genōn), and offers capacity (dynamis) as the mark of being. Cooper's note: the hunt's "long-delayed" seventh definition is what drives the metaphysics — "we can see Plato working out a new theory of the… Form of being."

Core Arguments

Claim: The sophist's genus is appearance-making (phantastikē), not faithful likeness-making (eikastikē). Because: a likeness keeps a model's true proportions; an appearance deliberately distorts them to seem right from a non-ideal viewpoint — what the sophist does with words at a distance from truth. Against: the sophist twists the very category, demanding "what is a copy?" — since defining a copy already invokes "what is not." Location: 235d–236c.
Claim: Calling the sophist a falsehood-maker generates an aporia, because false speech = saying "that which is not," which Parmenides forbids. Because: to believe/say falsely is to say "those which are not, that they are" — attaching being to not-being. Against: Parmenides frg. 7 — "Never shall this force itself on us, that that which is not may be" (237a); and "that which is not" seems self-refuting to utter (every attempt says "something," "one," "is" of it, 238–239). Location: 236d–239b.
Claim (the patricide): We must force that what-is-not somehow is, and what-is somehow is not. Because: every account of copies, images, and false speech collapses into contradiction "unless we either refute Parmenides' claims or else agree to accept them" (241e). Against: filial piety toward "father Parmenides" — the Visitor fears seeming a patricide and a madman (241d). Location: 241d–242b.
Claim: The mark (horos) of being is capacity (dynamis) — whatever can act on or be acted on, even once, is. Because: it is the one feature common to body and non-body that both warring camps of the "battle of gods and giants" (materialists vs. friends of the Forms) must invoke when they say each "is" (246a–247e). Against: the friends of the Forms reject it (being-known would change being); and Plato never simply endorses it — it is a lever, "since they don't have anything better" (247e). Location: 246a–249d.
Claim: There are five greatest kinds — being, rest, change, same, different — that blend selectively; discerning the blends is dialectic. Because: total blending makes rest change (impossible); zero blending makes speech itself impossible; so "some will and some won't," like letters needing vowels (253a); same and different are irreducible to being/rest/change. Against: economy — why five not three? The text argues each is irreducible. Location: 251a–255e.
Claim (the central move): Not-being is the different (to heteron), not the contrary of being. Negation signifies otherness, not opposition. Because: "not-large" picks out the equal as much as the small; "the not-beautiful" is just a portion of the nature of the different "set over against" the beautiful — and is as much a being as the beautiful. The different pervades all kinds, so each kind, qua different-from-the-rest, "is not" indefinitely many things. Against: Parmenides' explicit prohibition (re-quoted 258d); the Visitor knows he has gone "even beyond what he prohibited." Location: 256d–259b.
Claim: Logos is the weaving (symplokē) of name + verb; a false statement says of its subject "things different from those that are." Because: "Theaetetus flies" is of Theaetetus and says things "different from those that are" about him — now licensed, since not-being = the different; thought and belief are inner speech, so they too can be false. Against: the sophist's last redoubt — grant not-being shares in being, but deny speech shares in not-being; the analysis of logos closes that gap. Location: 259e–264b.

Key Findings

The dialogue's method is collection and division (diairesis), rehearsed on the angler; but its six initial definitions of the sophist never cohere — the metaphysics is what finally "pens him in."
Negation is rehabilitated as positive: "we won't agree with somebody who says that negation signifies a contrary… it signifies only… something different" (257b–c). Not-being is distributed across all beings like knowledge into sciences (257c).
Being itself becomes as puzzling as not-being: being can be neither rest nor change (else it would inherit a contrary), so it "falls outside both" (250d) — the is is as aporetic as the is not.
The Visitor will not exempt his own Eleatic tradition: the venerable monists "tell us a myth, as if we were children" (242c); the "one" cannot be a "whole" with parts and remain "completely without parts" (245a).

enantion / the contrary — silent key (257b)

The whole to heteron solution is defined by exclusion against enantion: not-being as the contrary of being is the reading the patricide must defeat, since a true contrary of being would be the very nothing Parmenides forbade (and falsehood would stay impossible). At 257b the Visitor explicitly refuses to say "negation signifies a contrary," fixing the negative as otherness not opposition — without that prior rejection, the equation not-being = the different has no work to do and no contrast to mark. The term is load-bearing by absence: enantion surfaces only sparingly (and largely in the denial at 257b, restated 258b), yet it is the hinge the entire central move turns on — every "not-X is a being" claim presupposes that "not" was first denied contrariety.

Concepts Developed

non-being — the Sophist is the locus classicus: to mē on reconceived as to heteron (the different), negation as otherness not contrariety, the patricide of Parmenides, the five greatest kinds, and dynamis as the mark of being.
collection-and-division — diairesis as the philosopher's method, made reflexive (252e–253e, 264b–268d); the "noble sophistry" (Socratic elenchus) is demoted to one species of it.
the communion of kinds (koinōnia tōn genōn) — Forms blend selectively; "the weaving together of forms is what makes speech possible" (259e). A revised, relational picture of the Forms.

Concepts Referenced

theory-of-forms — assumed throughout; thematized via the "friends of the Forms" position (248a) and the genesis/being split.
dynamis — capacity as the proposed mark of being; offered, not endorsed.
monism — Eleatic one-ism is the sustained target, not an interlocutor.

Key Passages

"Never shall this force itself on us, that that which is not may be" (237a; repeated 258d) — Parmenides' prohibition "Not to think that I'm turning into some kind of patricide" (241d) "there's something like a battle of gods and giants among them" (246a) "a thing really is if it has any capacity at all" (247d–e) — dynamis "that which is appears to fall outside both of them" (250d) — being's own aporia "it takes expertise in dialectic to divide things by kinds" (253d) "we won't agree with somebody who says that negation signifies a contrary" (257c) "It does not signify something contrary to that which is but only something different" (258b) "the weaving together of forms is what makes speech possible for us" (259e) "So it says those that are not, but that they are" (263b) — falsehood analysed

What's Not Obvious

The hunt for the sophist is what forces the ontology. The "greatest kinds" and the rehabilitation of not-being are not a metaphysical digression but the price of making one humble claim coherent — that the sophist "speaks what appears true but is false." Ontology arrives as the consequence of a definitional problem about a con-man.
The Sophist is Plato's strongest resistance to a charge the wiki already records against him. bestimmte-negation notes Hegel reading Platonic dialectic (the Parmenides) as "stopping at the negative result (Nothing)." But here negation is made positive — "not-X" is a being, a portion of the different. Plato's heteron is, however, static, distributive otherness with no Aufhebung, no negation-of-the-negation, no movement: 257b explicitly denies negation is contrariety. So it is a structural cousin of determinate negation that nonetheless lacks its engine. See claims#sophist-not-being-as-difference-vs-determinate-negation (candidate).
The patricide is a tradition's self-overcoming. It is a member of "those who gather around Parmenides and Zeno" (216a) who overturns the father's prohibition — and the same Parmenidean text (frg. 7, quoted 237a and 258d) that the wiki's parmenides page reads through Heidegger's Aletheia lens. The dialogue is the other canonical reception of Parmenides: father-to-be-killed rather than Aletheia-namer.

Critique / Limitations

The six initial divisions are dramatically vivid but metaphysically thin, and the genealogy from the final definition back to them "is not fully explored" (Cooper). Dynamis is offered to the giants as a dialectical lever, not endorsed as Plato's own definition of being. Whether the five "greatest kinds" are exhaustive is argued but not proven.

Connections

contrasts with bestimmte-negation — not-being-as-difference (static otherness, negation ≠ contrariety, no Aufhebung) vs Hegel's self-negating determinate negation; the Sophist also complicates Hegel's charge that Platonic dialectic stops at the negative. See claims#sophist-not-being-as-difference-vs-determinate-negation (candidate).
contrasts with parmenides — the "patricide" overturns father Parmenides' prohibition on not-being; the reception complementary to Heidegger's Aletheia-Parmenides (shared frg. 7).
contrasts with ontological-difference — false friend: Plato's to heteron is difference among beings/Forms, not Heidegger's Being/beings difference; do not conflate.
develops collection-and-division as the philosopher's science (dialectic as discerning which kinds blend).

The Sophist's being-question — the gigantomachia and the confession that "we are perplexed about what we mean by 'being'" (244a, 250d) — is the epigraph of heidegger-1927-sein-und-zeit, a primary locus of the wiki's Being-question seam.

Sources

Sophist, trans. Nicholas P. White, in Plato: Complete Works (Hackett, 1997), Stephanus 216a–268d; raw file lines 6158–8495. (White renders the offence against Parmenides as "patricide"; Cooper's note and the secondary tradition say "parricide.")
Depth layer: wiki/sources/.extraction-plato-sophist.md.