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The Sophist (Greek: Σοφιστής; Latin: Sophista) is a Platonic dialogue from the philosopher's late period, most likely written in 360 BC. Its main theme is to identify what a sophist is and how a sophist differs from a philosopher and statesman. Because each seems distinguished by a particular form of knowledge, the dialogue continues some of the lines of inquiry pursued in the epistemological dialogue, Theaetetus, which is said to have taken place the day before. Because the Sophist treats these matters, it is often taken to shed light on Plato's Theory of Forms and is compared with the Parmenides, which criticized what is often taken to be the theory of forms.
The dialogue is unusual in being one of three that do not feature Socrates, although as in its sequel, the Statesman, he is present to play a minor role (the other dialogue is the Laws). Instead, the Eleatic Stranger takes the lead in the discussion. The fact that Socrates is present but silent makes it difficult to attribute the views put forward by the Eleatic Stranger to Plato, beyond the difficulty inherent in taking any character to be an author's "mouthpiece."
This dialogue takes place a day after Plato's Theaetetus, and aims at defining the sophist. The participants are Socrates, who plays a minor role, a young mathematician, Theaetetus, and a visitor from Elea, the hometown of Parmenides.
Method of definition (216a–236d)
The Eleatic Stranger pursues a different method of definition than features in Plato's other dialogues by the use of a model, comparison of the model with the target kind, collection, and division (diairesis), of the collected kinds. At first he starts with the use of a mundane model (a fisherman), which shares some qualities in common with the target kind (the sophist). This common quality is the certain expertise (techne) in one subject. Then through the method of collection of different kinds (farming, caring for mortal bodies, for things that are put together or fabricated and imitation), he tries to bring them together into one kind, which he calls productive art. The same is true with the collection of learning, recognition, commerce, combat and hunting, which can be grouped into the kind of acquisitive art.
After these two collections, he proceeds to the division of the types of expertise into production and acquisition, and then he tries to find out to which of these two sub-kinds the fisherman belongs (classification), in this case, the acquisitive kind of expertise. By following the same method, namely, diairesis through collection, he divides the acquisitive art into possession taking and exchanging goods, to which sophistry belongs. The sophist is a kind of merchant. After many successive collections and divisions he finally arrives at the definition of the model (fisherman). Throughout this process the Eleatic Stranger classifies many kinds of activities (hunting, aquatic-hunting, fishing, strike-hunting).
After the verbal explanation of the model (definition), he tries to find out what the model and the target kind share in common (sameness) and what differentiates them (difference). Through this comparison, and after having been aware of the different kinds and sub-kinds, he can classify sophistry also among the other branches of the ‘tree’ of division of expertise as follows: "1. production, hunting by persuasion and money-earning, 2.acquisition, soul wholesaling, 3. soul retailing, retailing things that others make, 4. soul retailing, retailing things that he makes himself, 5. possession taking, competition, money-making expertise in debating."
Throughout the process of comparison of the distinguished kinds through his method of collection, the Eleatic Stranger discovers some attributes in relation to which the kinds can be divided (difference in relation to something). These are similar to the Categories of Aristotle, so to say: quantity, quality, relation, location, time, position, end etc.
After having failed to define sophistry, the Stranger attempts a final diairesis through the collection of the five definitions of sophistry. Since these five definitions share in common one quality (sameness), which is the imitation, he finally qualifies sophistry as imitation art. Following the division of the imitation art in copy-making and appearance-making, he discovers that sophistry falls under the appearance-making art, namely the Sophist imitates the wise man.
The sophist is presented negatively, but he can be said to be someone who merely pretends to have knowledge or to be a purveyor of false knowledge only if right opinion and false opinion can be distinguished. It seems impossible to say that the sophist presents things that are not as though they were, or passes off "non-being" as "being," since this would suggest that non-being exists, or that non-existence exists. Otherwise, the sophist couldn't "do" anything with it. The Stranger suggests that it is Parmenides' doctrine of being and non-being that is at the root of this problem, and so proceeds to criticize Parmenides' ideas, namely that "it is impossible that things that are not are."
Puzzles of being and not-being, great kinds (236d–264b)
The Eleatic Stranger, before proceeding to the final definition of sophistry, has to make clear the concepts that he used throughout the procedure of definition. In other words, he has to clarify what is the nature of the Being (that which is), Not-Being, sameness, difference, motion and rest, and how they are interrelated. Therefore, he examines Parmenides’ notion in comparison with Empedocles and Heraclitus’ in order to find out whether Being is identical with change or rest, or both.
The conclusion is that rest and change both "are," that is, both are beings; Parmenides had said that only rest "is." Furthermore, Being is a "kind" which all existing things share in common. Sameness is a "kind" that all things which belong to the same kind or genus share with reference to a certain attribute, and due to which diaeresis through collection is possible. Difference is a "kind" that makes things of the same genus distinct from one another; therefore it enables us to proceed to their division. Finally, so-called Not-Being is not the opposite of Being, but simply different from it. Therefore, the negation of Being is identified with "difference." Not-being is difference, not the opposite of Being.
Following these conclusions, the true statement can be distinguished from the false one, since each statement consists of a verb and a name. The name refers to the subject, and because a thought or a speech is always about something, and it cannot be about nothing (Non-Being). The verb is the sign of the action that the subject performs or the action being performed to or on the subject. When the verb states something that is about the subject, namely one of his properties, then the statement is true. While when the verb states something that is different (it is not) from the properties of the subject, then the statement is false, but is not attributing being to non-being.
It is plausible then, that ‘things that are not (appearing and seeming) somehow are’, and so it is also plausible that the sophist produces false appearances and imitates the wise man.
Final definition (264b–268d)
After having solved all these puzzles, that is to say the interrelation between being, not-being, difference and negation, as well as the possibility of the "appearing and seeming but not really being," the Eleatic Stranger can finally proceed to define sophistry. "Sophistry is a productive art, human, of the imitation kind, copy-making, of the appearance-making kind, uninformed and insincere in the form of contrary-speech-producing art."
Since Plato wrote the Statesman after the Sophist, while he never wrote the dialogue Philosopher, many scholars argue that Plato challenges the audience to search for the definition of the philosopher themselves, by applying the method of inquiry and definition shown in those two dialogues. However, this does not mean that one can simply extend the method in a mechanical way to the investigation of the philosopher, but he only shows us how one can proceed in such philosophical enquiries.
Aristotle picks up a number of themes dealt with in the Sophist in his own work De Interpretatione. Among these are the required parts of a statement (names and verbs) as well as affirmations and denials.
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