ΘΕΟ. ὦ Σώκρατες, φίλος ἁνήρ, ὥσπερ σὺ νυνδὴ εἶπες. οὐκ ἂν οὖν δεξαίμην διʼ ἐμοῦ ὁμολογοῦντος ἐλέγχεσθαι Πρωταγόραν, οὐδʼ αὖ σοὶ παρὰ δόξαν ἀντιτείνειν. τὸν οὖν Θεαίτητον πάλιν λαβέ· πάντως καὶ νυνδὴ μάλʼ ἐμμελῶς σοι ἐφαίνετο ὑπακούειν.
ΣΩ. ἆρα κἂν εἰς Λακεδαίμονα ἐλθών, ὦ Θεόδωρε, πρὸς τὰς παλαίστρας ἀξιοῖς ἂν ἄλλους θεώμενος γυμνούς, ἐνίους φαύλους, αὐτὸς μὴ ἀντεπιδεικνύναι τὸ εἶδος παραποδυόμενος;
ΘΕΟ. ἀλλὰ τί μὴν δοκεῖς, εἴπερ μέλλοιέν μοι ἐπιτρέψειν καὶ πείσεσθαι; ὥσπερ νῦν οἶμαι ὑμᾶς πείσειν ἐμὲ μὲν ἐᾶν θεᾶσθαι καὶ μὴ ἕλκειν πρὸς τὸ γυμνάσιον σκληρὸν ἤδη ὄντα, τῷ δὲ δὴ νεωτέρῳ τε καὶ ὑγροτέρῳ ὄντι προσπαλαίειν.
ΣΩ. ἀλλʼ εἰ οὕτως, ὦ Θεόδωρε, σοὶ φίλον, οὐδʼ ἐμοὶ ἐχθρόν, φασὶν οἱ παροιμιαζόμενοι. πάλιν δὴ οὖν ἐπὶ τὸν σοφὸν Θεαίτητον ἰτέον. λέγε δή, ὦ Θεαίτητε, πρῶτον μὲν ἃ νυνδὴ διήλθομεν, ἆρα οὐ σὺ θαυμάζεις εἰ ἐξαίφνης οὕτως ἀναφανήσῃ μηδὲν χείρων εἰς σοφίαν ὁτουοῦν ἀνθρώπων ἢ καὶ θεῶν; ἢ ἧττόν τι οἴει τὸ Πρωταγόρειον μέτρον εἰς θεοὺς ἢ εἰς ἀνθρώπους λέγεσθαι;
ΘΕΑΙ. μὰ Δίʼ οὐκ ἔγωγε· καὶ ὅπερ γε ἐρωτᾷς, πάνυ θαυμάζω. ἡνίκα γὰρ διῇμεν ὃν τρόπον λέγοιεν τὸ δοκοῦν ἑκάστῳ τοῦτο καὶ εἶναι τῷ δοκοῦντι, πάνυ μοι εὖ ἐφαίνετο λέγεσθαι· νῦν δὲ τοὐναντίον τάχα μεταπέπτωκεν.
ΣΩ. νέος γὰρ εἶ, ὦ φίλε παῖ· τῆς οὖν δημηγορίας ὀξέως ὑπακούεις καὶ πείθῃ. πρὸς γὰρ ταῦτα ἐρεῖ Πρωταγόρας ἤ τις ἄλλος ὑπὲρ αὐτοῦ· «ὦ γενναῖοι παῖδές τε καὶ γέροντες, δημηγορεῖτε συγκαθεζόμενοι, θεούς τε εἰς τὸ μέσον ἄγοντες, οὓς ἐγὼ ἔκ τε τοῦ λέγειν καὶ τοῦ γράφειν περὶ αὐτῶν ὡς εἰσὶν ἢ ὡς οὐκ εἰσίν, ἐξαιρῶ, καὶ ἃ οἱ πολλοὶ ἂν ἀποδέχοιντο ἀκούοντες, λέγετε ταῦτα, ὡς δεινὸν εἰ μηδὲν διοίσει εἰς σοφίαν ἕκαστος τῶν ἀνθρώπων βοσκήματος ὁτουοῦν· ἀπόδειξιν δὲ καὶ ἀνάγκην οὐδʼ ἡντινοῦν λέγετε ἀλλὰ τῷ εἰκότι χρῆσθε, ᾧ εἰ ἐθέλοι Θεόδωρος ἢ ἄλλος τις τῶν γεωμετρῶν χρώμενος γεωμετρεῖν, ἄξιος οὐδʼ ἑνὸς μόνου ἂν εἴη. σκοπεῖτε οὖν σύ τε καὶ Θεόδωρος εἰ ἀποδέξεσθε πιθανολογίᾳ τε καὶ εἰκόσι περὶ τηλικούτων λεγομένους λόγους.»
THEO. Socrates, the man was my friend, as you just remarked. So I should hate to bring about the refutation of Protagoras by agreeing with you, and I should hate also to oppose you contrary to my real convictions. So take Theaetetus again; especially as he seemed just now to follow your suggestions very carefully.
SOC. If you went to Sparta, Theodorus, and visited the wrestling-schools, would you think it fair to look on at other people naked, some of whom were of poor physique, without stripping and showing your own form, too?
THEO. Why not, if I could persuade them to allow me to do so? So now I think I shall persuade you to let me be a spectator, and not to drag me into the ring, since I am old and stiff, but to take the younger and nimbler man as your antagonist.
SOC. Well, Theodorus, if that pleases you, it does not displease me, as the saying is. So I must attack the wise Theaetetus again. Tell me, Theaetetus, referring to the doctrine we have just expounded, do you not share my amazement at being suddenly exalted to an equality with the wisest man, or even god? Or do you think Protagoras’s “measure” applies any less to gods than to men?
THEAET. By no means; and I am amazed that you ask such a question at all; for when we were discussing the meaning of the doctrine that whatever appears to each one really is to him, I thought it was good; but now it has suddenly changed to the opposite.
SOC. You are young, my dear boy; so you are quickly moved and swayed by popular oratory. For in reply to what I have said, Protagoras, or someone speaking for him, will say, “Excellent boys and old men, there you sit together declaiming to the people, and you bring in the gods, the question of whose existence or non-existence I exclude from oral and written discussion, and you say the sort of thing that the crowd would readily accept—that it is a terrible thing if every man is to be no better than any beast in point of wisdom; but you do not advance any cogent proof whatsoever; you base your statements on probability. If Theodorus, or any other geometrician, should base his geometry on probability, he would be of no account at all. So you and Theodorus had better consider whether you will accept arguments founded on plausibility and probabilities in such important matters.”
ΘΕΑΙ. ἀλλʼ οὐ δίκαιον, ὦ Σώκρατες, οὔτε σὺ οὔτε ἂν ἡμεῖς φαῖμεν.
ΣΩ. ἄλλῃ δὴ σκεπτέον, ὡς ἔοικεν, ὡς ὅ τε σὸς καὶ ὁ Θεοδώρου λόγος.
ΘΕΑΙ. πάνυ μὲν οὖν ἄλλῃ.
ΣΩ. τῇδε δὴ σκοπῶμεν εἰ ἄρα ἐστὶν ἐπιστήμη τε καὶ αἴσθησις ταὐτὸν ἢ ἕτερον. εἰς γὰρ τοῦτό που πᾶς ὁ λόγος ἡμῖν ἔτεινεν, καὶ τούτου χάριν τὰ πολλὰ καὶ ἄτοπα ταῦτα ἐκινήσαμεν. οὐ γάρ;
ΘΕΑΙ. παντάπασι μὲν οὖν.
ΣΩ. ἦ οὖν ὁμολογήσομεν, ἃ τῷ ὁρᾶν αἰσθανόμεθα ἢ τῷ ἀκούειν, πάντα ταῦτα ἅμα καὶ ἐπίστασθαι; οἷον τῶν βαρβάρων πρὶν μαθεῖν τὴν φωνὴν πότερον οὐ φήσομεν ἀκούειν ὅταν φθέγγωνται, ἢ ἀκούειν τε καὶ ἐπίστασθαι ἃ λέγουσι; καὶ αὖ γράμματα μὴ ἐπιστάμενοι, βλέποντες εἰς αὐτὰ πότερον οὐχ ὁρᾶν ἢ ἐπίστασθαι εἴπερ ὁρῶμεν διισχυριούμεθα;
ΘΕΑΙ. αὐτό γε, ὦ Σώκρατες, τοῦτο αὐτῶν, ὅπερ ὁρῶμέν τε καὶ ἀκούομεν, ἐπίστασθαι φήσομεν· τῶν μὲν γὰρ τὸ σχῆμα καὶ τὸ χρῶμα ὁρᾶν τε καὶ ἐπίστασθαι, τῶν δὲ τὴν ὀξύτητα καὶ βαρύτητα ἀκούειν τε ἅμα καὶ εἰδέναι· ἃ δὲ οἵ τε γραμματισταὶ περὶ αὐτῶν καὶ οἱ ἑρμηνῆς διδάσκουσιν, οὔτε αἰσθάνεσθαι τῷ ὁρᾶν ἢ ἀκούειν οὔτε ἐπίστασθαι.
ΣΩ. ἄριστά γʼ, ὦ Θεαίτητε, καὶ οὐκ ἄξιόν σοι πρὸς ταῦτα ἀμφισβητῆσαι, ἵνα καὶ αὐξάνῃ. ἀλλʼ ὅρα δὴ καὶ τόδε ἄλλο προσιόν, καὶ σκόπει πῇ αὐτὸ διωσόμεθα.
ΘΕΑΙ. τὸ ποῖον δή;
ΣΩ. τὸ τοιόνδε· εἴ τις ἔροιτο· «ἆρα δυνατὸν ὅτου τις ἐπιστήμων γένοιτό ποτε, ἔτι ἔχοντα μνήμην αὐτοῦ τούτου καὶ σῳζόμενον, τότε ὅτε μέμνηται μὴ ἐπίστασθαι αὐτὸ τοῦτο ὃ μέμνηται;» μακρολογῶ δέ, ὡς ἔοικε, βουλόμενος ἐρέσθαι εἰ μαθών τίς τι μεμνημένος μὴ οἶδε.
ΘΕΑΙ. καὶ πῶς, ὦ Σώκρατες; τέρας γὰρ ἂν εἴη ὃ λέγεις.
ΣΩ. μὴ οὖν ἐγὼ ληρῶ; σκόπει δέ. ἆρα τὸ ὁρᾶν οὐκ αἰσθάνεσθαι λέγεις καὶ τὴν ὄψιν αἴσθησιν;
ΘΕΑΙ. ἔγωγε.
ΣΩ. οὐκοῦν ὁ ἰδών τι ἐπιστήμων ἐκείνου γέγονεν ὃ εἶδεν κατὰ τὸν ἄρτι λόγον;
ΘΕΑΙ. ναί.
ΣΩ. τί δέ; μνήμην οὐ λέγεις μέντοι τι;
ΘΕΑΙ. ναί.
ΣΩ. πότερον οὐδενὸς ἢ τινός;
ΘΕΑΙ. τινὸς δήπου.
ΣΩ. οὐκοῦν ὧν ἔμαθε καὶ ὧν ᾔσθετο, τοιουτωνί τινων;
ΘΕΑΙ. τί μήν;
ΣΩ. ὃ δὴ εἶδέ τις, μέμνηταί που ἐνίοτε;
ΘΕΑΙ. μέμνηται.
ΣΩ. ἦ καὶ μύσας; ἢ τοῦτο δράσας ἐπελάθετο;
ΘΕΑΙ. ἀλλὰ δεινόν, ὦ Σώκρατες, τοῦτό γε φάναι.
THEAET. That would not be right, Socrates; neither you nor we would think so.
SOC. Apparently, then, you and Theodorus mean we must look at the matter in a different way.
THEAET. Yes, certainly in a different way.
SOC. Well, then, let us look at it in this way, raising the question whether knowledge is after all the same as perception, or different. For that is the object of all our discussion, and it was to answer that question than we stirred up all these strange doctrines, was it not?
THEAET. Most assuredly.
SOC. Shall we then agree that all that we perceive by sight or hearing we know? For instance, shall we say that before having learned the language of foreigners we do not hear them when they speak, or that we both hear and know what they say? And again, if we do not know the letters, shall we maintain that we do not see them when we look at them or that if we really see them we know them?
THEAET. We shall say, Socrates, that we know just so much of them as we hear or see: in the case of the letters, we both see and know the form and color, and in the spoken language we both hear and at the same time know the higher and lower notes of the voice; but we do not perceive through sight or hearing, and we do not know, what the grammarians and interpreters teach about them.
SOC. First-rate, Theaetetus! and it is a pity to dispute that, for I want you to grow. But look out for another trouble that is yonder coming towards us, and see how we can repel it.
THEAET. What is it?
SOC. It is like this: If anyone should ask, “Is it possible, if a man has ever known a thing and still has and preserves a memory of that thing, that he does not, at the time when he remembers, know that very thing which he remembers?” I seem to be pretty long winded; but I merely want to ask if a man who has learned a thing does not know it when he remembers it.
THEAET. Of course he does, Socrates; for what you suggest would be monstrous.
SOC. Am I crazy, then? Look here. Do you not say that seeing is perceiving and that sight is perception?
THEAET. I do.
SOC. Then, according to what we have just said, the man who has seen a thing has acquired knowledge of that which he has seen?
THEAET. Yes.
SOC. Well, then, do you not admit that there is such a thing as memory?
THEAET. Yes.
SOC. Memory of nothing or of something?
THEAET. Of something, surely.
SOC. Of things he has learned and perceived—that sort of things?
THEAET. Of course.
SOC. A man sometimes remembers what he has seen, does he not?
THEAET. He does.
SOC. Even when he shuts his eyes, or does he forget if he does that?
THEAET. It would be absurd to say that, Socrates.
ΣΩ. δεῖ γε μέντοι, εἰ σώσομεν τὸν πρόσθε λόγον· εἰ δὲ μή, οἴχεται.
ΘΕΑΙ. καὶ ἐγώ, νὴ τὸν Δία, ὑποπτεύω, οὐ μὴν ἱκανῶς γε συννοῶ· ἀλλʼ εἰπὲ πῇ.
ΣΩ. τῇδε· ὁ μὲν ὁρῶν ἐπιστήμων, φαμέν, τούτου γέγονεν οὗπερ ὁρῶν· ὄψις γὰρ καὶ αἴσθησις καὶ ἐπιστήμη ταὐτὸν ὡμολόγηται.
ΘΕΑΙ. πάνυ γε.
ΣΩ. ὁ δέ γε ὁρῶν καὶ ἐπιστήμων γεγονὼς οὗ ἑώρα, ἐὰν μύσῃ, μέμνηται μέν, οὐχ ὁρᾷ δὲ αὐτό. ἦ γάρ;
ΘΕΑΙ. ναί.
ΣΩ. τὸ δέ γε «οὐχ ὁρᾷ» «οὐκ ἐπίσταταί» ἐστιν, εἴπερ καὶ τὸ «ὁρᾷ» «ἐπίσταται.»
ΘΕΑΙ. ἀληθῆ.
ΣΩ. συμβαίνει ἄρα, οὗ τις ἐπιστήμων ἐγένετο, ἔτι μεμνημένον αὐτὸν μὴ ἐπίστασθαι, ἐπειδὴ οὐχ ὁρᾷ· ὃ τέρας ἔφαμεν ἂν εἶναι εἰ γίγνοιτο.
ΘΕΑΙ. ἀληθέστατα λέγεις.
ΣΩ. τῶν ἀδυνάτων δή τι συμβαίνειν φαίνεται ἐάν τις ἐπιστήμην καὶ αἴσθησιν ταὐτὸν φῇ εἶναι.
ΘΕΑΙ. ἔοικεν.
ΣΩ. ἄλλο ἄρα ἑκάτερον φατέον.
ΘΕΑΙ. κινδυνεύει.
ΣΩ. τί οὖν δῆτʼ ἂν εἴη ἐπιστήμη; πάλιν ἐξ ἀρχῆς, ὡς ἔοικεν, λεκτέον. καίτοι τί ποτε μέλλομεν, ὦ Θεαίτητε, δρᾶν;
ΘΕΑΙ. τίνος πέρι;
ΣΩ. φαινόμεθά μοι ἀλεκτρυόνος ἀγεννοῦς δίκην πρὶν νενικηκέναι ἀποπηδήσαντες ἀπὸ τοῦ λόγου ᾁδειν.
ΘΕΑΙ. πῶς δή;
ΣΩ. ἀντιλογικῶς ἐοίκαμεν πρὸς τὰς τῶν ὀνομάτων ὁμολογίας ἀνομολογησάμενοι καὶ τοιούτῳ τινὶ περιγενόμενοι τοῦ λόγου ἀγαπᾶν, καὶ οὐ φάσκοντες ἀγωνισταὶ ἀλλὰ φιλόσοφοι εἶναι λανθάνομεν ταὐτὰ ἐκείνοις τοῖς δεινοῖς ἀνδράσιν ποιοῦντες.
ΘΕΑΙ. οὔπω μανθάνω ὅπως λέγεις.
ΣΩ. ἀλλʼ ἐγὼ πειράσομαι δηλῶσαι περὶ αὐτῶν ὅ γε δὴ νοῶ. ἠρόμεθα γὰρ δὴ εἰ μαθὼν καὶ μεμνημένος τίς τι μὴ ἐπίσταται, καὶ τὸν ἰδόντα καὶ μύσαντα μεμνημένον ὁρῶντα δὲ οὒ ἀποδείξαντες, οὐκ εἰδότα ἀπεδείξαμεν καὶ ἅμα μεμνημένον· τοῦτο δʼ εἶναι ἀδύνατον. καὶ οὕτω δὴ μῦθος ἀπώλετο ὁ Πρωταγόρειος, καὶ ὁ σὸς ἅμα ὁ τῆς ἐπιστήμης καὶ αἰσθήσεως ὅτι ταὐτόν ἐστιν.
ΘΕΑΙ. φαίνεται.
ΣΩ. οὔ τι ἄν, οἶμαι, ὦ φίλε, εἴπερ γε ὁ πατὴρ τοῦ ἑτέρου μύθου ἔζη, ἀλλὰ πολλὰ ἂν ἤμυνε· νῦν δὲ ὀρφανὸν αὐτὸν ἡμεῖς προπηλακίζομεν. καὶ γὰρ οὐδʼ οἱ ἐπίτροποι, οὓς Πρωταγόρας κατέλιπεν, βοηθεῖν ἐθέλουσιν, ὧν Θεόδωρος εἷς ὅδε. ἀλλὰ δὴ αὐτοὶ κινδυνεύσομεν τοῦ δικαίου ἕνεκʼ αὐτῷ βοηθεῖν.
SOC. We must, though, if we are to maintain our previous argument; otherwise, it is all up with it.
THEAET. I too, by Zeus, have my suspicions, but I don’t fully understand you. Tell me how it is.
SOC. This is how it is: he who sees has acquired knowledge, we say, of that which he has seen; for it is agreed that sight and perception and knowledge are all the same.
THEAET. Certainly.
SOC. But he who has seen and has acquired knowledge of what he saw, if he shuts his eyes, remembers it, but does not see it. Is that right?
THEAET. Yes.
SOC. But “does not see” is the same as “does not know,” if it is true that seeing is knowing.
THEAET. True.
SOC. Then this is our result. When a man has acquired knowledge of a thing and still remembers it, he does not know it, since he does not see it; but we said that would be a monstrous conclusion.
THEAET. Very true.
SOC. So, evidently, we reach an impossible result if we say that knowledge and perception are the same.
THEAET. So it seems.
SOC. Then we must say they are different.
THEAET. I suppose so.
SOC. Then what can knowledge be? We must, apparently, begin our discussion all over again. And yet, Theaetetus, what are we on the point of doing?
THEAET. About what?
SOC. It seems to me that we are behaving like a worthless game-cock; before winning the victory we have leapt away from our argument and begun to crow.
THEAET. How so?
SOC. We seem to be acting like professional debaters; we have based our agreements on the mere similarity of words and are satisfied to have got the better of the argument in such a way, and we do not see that we, who claim to be, not contestants for a prize, but lovers of wisdom, are doing just what those ingenious persons do.
THEAET. I do not yet understand what you mean.
SOC. Well, I will try to make my thought clear. We asked, you recollect, whether a man who has learned something and remembers it does not know it. We showed first that the one who has seen and then shuts his eyes remembers, although he does not see, and then we showed that he does not know, although at the same time he remembers; but this, we said, was impossible. And so the Protagorean tale was brought to naught, and yours also about the identity of knowledge and perception.
THEAET. Evidently.
SOC. It would not be so, I fancy, my friend, if the father of the first of the two tales were alive; he would have had a good deal to say in its defence. But he is dead, and we are abusing the orphan. Why, even the guardians whom Protagoras left—one of whom is Theodorus here—are unwilling to come to the child’s assistance. So it seems that we shall have to do it ourselves, assisting him in the name of justice.
ΘΕΟ. οὐ γὰρ ἐγώ, ὦ Σώκρατες, ἀλλὰ μᾶλλον Καλλίας ὁ Ἱππονίκου τῶν ἐκείνου ἐπίτροπος· ἡμεῖς δέ πως θᾶττον ἐκ τῶν ψιλῶν λόγων πρὸς τὴν γεωμετρίαν ἀπενεύσαμεν. χάριν γε μέντοι σοὶ ἕξομεν ἐὰν αὐτῷ βοηθῇς.
ΣΩ. καλῶς λέγεις, ὦ Θεόδωρε. σκέψαι οὖν τήν γʼ ἐμὴν βοήθειαν. τῶν γὰρ ἄρτι δεινότερα ἄν τις ὁμολογήσειεν μὴ προσέχων τοῖς ῥήμασι τὸν νοῦν, ᾗ τὸ πολὺ εἰθίσμεθα φάναι τε καὶ ἀπαρνεῖσθαι. σοὶ λέγω ὅπῃ, ἢ Θεαιτήτῳ.
ΘΕΟ. εἰς τὸ κοινὸν μὲν οὖν, ἀποκρινέσθω δὲ ὁ νεώτερος· σφαλεὶς γὰρ ἧττον ἀσχημονήσει.
ΣΩ. λέγω δὴ τὸ δεινότατον ἐρώτημα, ἔστι δὲ οἶμαι τοιόνδε τι· «ἆρα οἷόν τε τὸν αὐτὸν εἰδότα τι τοῦτο ὃ οἶδεν μὴ εἰδέναι;»
ΘΕΟ. τί δὴ οὖν ἀποκρινούμεθα, ὦ Θεαίτητε;
ΘΕΑΙ. ἀδύνατόν που, οἶμαι ἔγωγε.
ΣΩ. οὔκ, εἰ τὸ ὁρᾶν γε ἐπίστασθαι θήσεις. τί γὰρ χρήσῃ ἀφύκτῳ ἐρωτήματι, τὸ λεγόμενον ἐν φρέατι συσχόμενος, ὅταν ἐρωτᾷ ἀνέκπληκτος ἀνήρ, καταλαβὼν τῇ χειρὶ σοῦ τὸν ἕτερον ὀφθαλμόν, εἰ ὁρᾷς τὸ ἱμάτιον τῷ κατειλημμένῳ;
ΘΕΑΙ. οὐ φήσω οἶμαι τούτῳ γε, τῷ μέντοι ἑτέρῳ.
ΣΩ. οὐκοῦν ὁρᾷς τε καὶ οὐχ ὁρᾷς ἅμα ταὐτόν;
ΘΕΑΙ. οὕτω γέ πως.
ΣΩ. οὐδὲν ἐγώ, φήσει, τοῦτο οὔτε τάττω οὔτʼ ἠρόμην τὸ ὅπως, ἀλλʼ εἰ ὃ ἐπίστασαι, τοῦτο καὶ οὐκ ἐπίστασαι. νῦν δὲ ὃ οὐχ ὁρᾷς ὁρῶν φαίνῃ. ὡμολογηκὼς δὲ τυγχάνεις τὸ ὁρᾶν ἐπίστασθαι καὶ τὸ μὴ ὁρᾶν μὴ ἐπίστασθαι. ἐξ οὖν τούτων λογίζου τί σοι συμβαίνει.
ΘΕΑΙ. ἀλλὰ λογίζομαι ὅτι τἀναντία οἷς ὑπεθέμην.
ΣΩ. ἴσως δέ γʼ, ὦ θαυμάσιε, πλείω ἂν τοιαῦτʼ ἔπαθες εἴ τίς σε προσηρώτα εἰ ἐπίστασθαι ἔστι μὲν ὀξύ, ἔστι δὲ ἀμβλύ, καὶ ἐγγύθεν μὲν ἐπίστασθαι, πόρρωθεν δὲ μή, καὶ σφόδρα καὶ ἠρέμα τὸ αὐτό, καὶ ἄλλα μυρία, ἃ ἐλλοχῶν ἂν πελταστικὸς ἀνὴρ μισθοφόρος ἐν λόγοις ἐρόμενος, ἡνίκʼ ἐπιστήμην καὶ αἴσθησιν ταὐτὸν ἔθου, ἐμβαλὼν ἂν εἰς τὸ ἀκούειν καὶ ὀσφραίνεσθαι καὶ τὰς τοιαύτας αἰσθήσεις, ἤλεγχεν ἂν ἐπέχων καὶ οὐκ ἀνιεὶς πρὶν θαυμάσας τὴν πολυάρατον σοφίαν συνεποδίσθης ὑπʼ αὐτοῦ, οὗ δή σε χειρωσάμενός τε καὶ συνδήσας ἤδη ἂν τότε ἐλύτρου χρημάτων ὅσων σοί τε κἀκείνῳ ἐδόκει. τίνʼ οὖν δὴ ὁ Πρωταγόρας, φαίης ἂν ἴσως, λόγον ἐπίκουρον τοῖς αὑτοῦ ἐρεῖ; ἄλλο τι πειρώμεθα λέγειν;
ΘΕΑΙ. πάνυ μὲν οὖν.
THEO. Do so, for it is not I, Socrates, but rather Callias the son of Hipponicus, who is the guardian of his children. As for me, I turned rather too soon from abstract speculations to geometry. However, I shall be grateful to you if you come to his assistance.
SOC. Good, Theodorus! Now see how I shall help him; for a man might find himself involved in still worse inconsistencies than those in which we found ourselves just now, if he did not pay attention to the terms which we generally use in assent and denial. Shall I explain this to you, or only to Theaetetus?
THEO. To both of us, but let the younger answer; for he will be less disgraced if he is discomfited.
SOC. Very well; now I am going to ask the most frightfully difficult question of all. It runs, I believe, something like this: Is it possible for a person, if he knows a thing, at the same time not to know that which he knows?
THEO. Now, then, what shall we answer, Theaetetus?
THEAET. It is impossible, I should think.
SOC. Not if you make seeing and knowing identical. For what will you do with a question from which there is no escape, by which you are, as the saying is, caught in a pit, when your adversary, unabashed, puts his hand over one of your eyes and asks if you see his cloak with the eye that is covered?
THEAET. I shall say, I think, “Not with that eye, but with the other.”
SOC. Then you see and do not see the same thing at the same time?
THEAET. After a fashion.
SOC. “That,” he will reply, “is not at all what I want, and I did not ask about the fashion, but whether you both know and do not know the same thing. Now manifestly you see that which you do not see. But you have agreed that seeing is knowing and not seeing is not knowing. Very well; from all this, reckon out what the result is.”
THEAET. Well, I reckon out that the result is the contrary of my hypothesis.
SOC. And perhaps, my fine fellow, more troubles of the same sort might have come upon you, if anyone asked you further questions—whether it is possible to know the same thing both sharply and dully, to know close at hand but not at a distance, to know both violently and gently, and countless other questions, such as a nimble fighter, fighting for pay in the war of words, might have lain in wait and asked you, when you said that knowledge and perception were the same thing; he would have charged down upon hearing and smelling and such senses, and would have argued persistently and unceasingly until you were filled with admiration of his greatly desired wisdom and were taken in his toils, and then, after subduing and binding you he would at once proceed to bargain with you for such ransom as might be agreed upon between you. What argument, then, you might ask, will Protagoras produce to strengthen his forces? Shall we try to carry on the discussion?
THEAET. By all means.
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