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THEAETETUS: Certainly.

STRANGER: There is a great deal of this kind of thing in painting, and in all imitation.

THEAETETUS: Of course.

STRANGER: And may we not fairly call the sort of art, which produces an appearance and not an image, phantastic art?

THEAETETUS: Most fairly.

STRANGER: These then are the two kinds of image-making—the art of making likenesses, and phantastic or the art of making appearances?

THEAETETUS: True.

STRANGER: I was doubtful before in which of them I should place the Sophist, nor am I even now able to see clearly; verily he is a wonderful and inscrutable creature. And now in the cleverest manner he has got into an impossible place.

THEAETETUS: Yes, he has.

STRANGER: Do you speak advisedly, or are you carried away at the moment by the habit of assenting into giving a hasty answer?

THEAETETUS: May I ask to what you are referring?

STRANGER: My dear friend, we are engaged in a very difficult speculation—there can be no doubt of that; for how a thing can appear and seem, and not be, or how a man can say a thing which is not true, has always been and still remains a very perplexing question. Can any one say or think that falsehood really exists, and avoid being caught in a contradiction? Indeed, Theaetetus, the task is a difficult one.

THEAETETUS: Why?

STRANGER: He who says that falsehood exists has the audacity to assert the being of not-being; for this is implied in the possibility of falsehood. But, my boy, in the days when I was a boy, the great Parmenides protested against this doctrine, and to the end of his life he continued to inculcate the same lesson—always repeating both in verse and out of verse:

'Keep your mind from this way of enquiry, for never will you show that not-being is.'

Such is his testimony, which is confirmed by the very expression when sifted a little. Would you object to begin with the consideration of the words themselves?

THEAETETUS: Never mind about me; I am only desirous that you should carry on the argument in the best way, and that you should take me with you.

STRANGER: Very good; and now say, do we venture to utter the forbidden word 'not-being'?

THEAETETUS: Certainly we do.

STRANGER: Let us be serious then, and consider the question neither in strife nor play: suppose that one of the hearers of Parmenides was asked, 'To what is the term "not-being" to be applied?'—do you know what sort of object he would single out in reply, and what answer he would make to the enquirer?

THEAETETUS: That is a difficult question, and one not to be answered at all by a person like myself.

STRANGER: There is at any rate no difficulty in seeing that the predicate 'not-being' is not applicable to any being.

THEAETETUS: None, certainly.

STRANGER: And if not to being, then not to something.

THEAETETUS: Of course not.

STRANGER: It is also plain, that in speaking of something we speak of being, for to speak of an abstract something naked and isolated from all being is impossible.

THEAETETUS: Impossible.

STRANGER: You mean by assenting to imply that he who says something must say some one thing?

THEAETETUS: Yes.

STRANGER: Some in the singular (ti) you would say is the sign of one, some in the dual (tine) of two, some in the plural (tines) of many?

THEAETETUS: Exactly.

STRANGER: Then he who says 'not something' must say absolutely nothing.

THEAETETUS: Most assuredly.

STRANGER: And as we cannot admit that a man speaks and says nothing, he who says 'not-being' does not speak at all.

THEAETETUS: The difficulty of the argument can no further go.

STRANGER: Not yet, my friend, is the time for such a word; for there still remains of all perplexities the first and greatest, touching the very foundation of the matter.

THEAETETUS: What do you mean? Do not be afraid to speak.

STRANGER: To that which is, may be attributed some other thing which is?

THEAETETUS: Certainly.

STRANGER: But can anything which is, be attributed to that which is not?

THEAETETUS: Impossible.

STRANGER: And all number is to be reckoned among things which are?

THEAETETUS: Yes, surely number, if anything, has a real existence.

STRANGER: Then we must not attempt to attribute to not-being number either in the singular or plural?

THEAETETUS: The argument implies that we should be wrong in doing so.

STRANGER: But how can a man either express in words or even conceive in thought things which are not or a thing which is not without number?

THEAETETUS: How indeed?

STRANGER: When we speak of things which are not, are we not attributing plurality to not-being?

THEAETETUS: Certainly.

STRANGER: But, on the other hand, when we say 'what is not,' do we not attribute unity?

THEAETETUS: Manifestly.

STRANGER: Nevertheless, we maintain that you may not and ought not to attribute being to not-being?

THEAETETUS: Most true.

STRANGER: Do you see, then, that not-being in itself can neither be spoken, uttered, or thought, but that it is unthinkable, unutterable, unspeakable, indescribable?

THEAETETUS: Quite true.

STRANGER: But, if so, I was wrong in telling you just now that the difficulty which was coming is the greatest of all.

THEAETETUS: What! is there a greater still behind?

STRANGER: Well, I am surprised, after what has been said already, that you do not see the difficulty in which he who would refute the notion of not-being is involved. For he is compelled to contradict himself as soon as he makes the attempt.

THEAETETUS: What do you mean? Speak more clearly.

STRANGER: Do not expect clearness from me. For I, who maintain that not-being has no part either in the one or many, just now spoke and am still speaking of not-being as one; for I say 'not-being.' Do you understand?

THEAETETUS: Yes.

STRANGER: And a little while ago I said that not-being is unutterable, unspeakable, indescribable: do you follow?

THEAETETUS: I do after a fashion.

STRANGER: When I introduced the word 'is,' did I not contradict what I said before?

THEAETETUS: Clearly.

STRANGER: And in using the singular verb, did I not speak of not-being as one?

THEAETETUS: Yes.

STRANGER: And when I spoke of not-being as indescribable and unspeakable and unutterable, in using each of these words in the singular, did I not refer to not-being as one?