261
Theaetetus
Theaet. It certainly seems, Stranger, that what you said at first about the sophist—that he was a hard kind of creature to catch—is true; for he seems to have no end of defences, Perhaps a sort of pun is intended, for πρόβλημα was already beginning to have the meaning of problem. and when he throws one of them up, his opponent has first to fight through it before he can reach the man himself; for now, you see, we have barely passed through the non-existence of being, which was his first prepared line of defence, when we find another line ready; and so we must prove that falsehood exists in relation to opinion and to speech; and after this, perhaps, there will be another line, and still another after that; and it seems no end will ever appear.
Stranger
Str. No one should be discouraged, Theaetetus, who can make constant progress, even though it be slow. For if a man is discouraged under these conditions, what would he do under others—if he did not get ahead at all or were even pressed back? It would be a long time, as the saying is, before such a man would ever take a city. But now, my friend, since we have passed the line you speak of, the main defences would surely be in our hands, and the rest will now be smaller and easier to take.
Stranger
Str. First, then, let us take up speech and opinion, as I said just now, in order to come to a clearer understanding whether not-being touches them, or they are both entirely true, and neither is ever false.
5
Theaetetus
Theaet. Very well.
