SOCRATES: We are supposed to acquire a right opinion of the differences which distinguish one thing from another when we have already a right opinion of them, and so we go round and round:--the revolution of the scytal, or pestle, or any other rotatory machine, in the same circles, is as nothing compared with such a requirement; and we may be truly described as the blind directing the blind; for to add those things which we already have, in order that we may learn what we already think, is like a soul utterly benighted. THEAETETUS: Tell me; what were you going to say just now, when you asked the question? SOCRATES: If, my boy, the argument, in speaking of adding the definition, had used the word to 'know,' and not merely 'have an opinion' of the difference, this which is the most promising of all the definitions of knowledge would have come to a pretty end, for to know is surely to acquire knowledge. THEAETETUS: True. SOCRATES: And so, when the question is asked, What is knowledge? this fair argument will answer 'Right opinion with knowledge,'--knowledge, that is, of difference, for this, as the said argument maintains, is adding the definition. THEAETETUS: That seems to be true. SOCRATES: But how utterly foolish, when we are asking what is knowledge, that the reply should only be, right opinion with knowledge of difference or of anything! And so, Theaetetus, knowledge is neither sensation nor true opinion, nor yet definition and explanation accompanying and added to true opinion? THEAETETUS: I suppose not. SOCRATES: And are you still in labour and travail, my dear friend, or have you brought all that you have to say about knowledge to the birth? THEAETETUS: I am sure, Socrates, that you have elicited from me a good deal more than ever was in me. SOCRATES: And does not my art show that you have brought forth wind, and that the offspring of your brain are not worth bringing up? THEAETETUS: Very true. SOCRATES: But if, Theaetetus, you should ever conceive afresh, you will be all the better for the present investigation, and if not, you will be soberer and humbler and gentler to other men, and will be too modest to fancy that you know what you do not know. These are the limits of my art; I can no further go, nor do I know aught of the things which great and famous men know or have known in this or former ages. The office of a midwife I, like my mother, have received from God; she delivered women, I deliver men; but they must be young and noble and fair. And now I have to go to the porch of the King Archon, where I am to meet Meletus and his indictment. To-morrow morning, Theodorus, I shall hope to see you again at this place.