Theaetetus
Plato (428–347 BC)
Plato's Theaetetus in the Greek text edited by John Burnet, with Harold North Fowler's English translation.
Section 142
Section 143
Section 144
Section 145
Section 146
Section 147
Section 148
Section 149
Section 150
Section 151
Section 152
Section 153
Section 154
Section 155
Section 156
Section 157
Section 158
Section 159
Section 160
Section 161
Section 162
Section 163
Section 164
Section 165
Section 166
Section 167
Section 168
Section 169
Section 170
Section 171
Section 172
Section 173
Section 174
Section 175
Section 176
Section 177
Section 178
Section 179
Section 180
Section 181
Section 182
Section 183
Section 184
Section 185
Section 186
Section 187
Section 188
Section 189
Section 190
Section 191
Section 192
Section 193
Section 194
Section 195
Section 196
Section 197
Section 198
Section 199
Section 200
SOC. It is not easy, Theaetetus, to refrain from praising you. However, examine your suggestion once more. Let it be as you say: the man who catches the ignorance will, you say, have false opinion. Is that it?
THEAET. Yes.
SOC. But surely he will not also think that he has false opinion.
THEAET. Certainly not.
SOC. No, but true opinion, and will have the attitude of knowing that about which he is deceived.
THEAET. Of course.
SOC. Hence he will fancy that he has caught, and has, knowledge, not ignorance.
THEAET. Evidently.
SOC. Then, after our long wanderings, we have come round again to our first difficulty. For the real reasoner will laugh and say, Most excellent Sirs, does a man who knows both knowledge and ignorance think that one of them, which he knows, is another thing which he knows; or, knowing neither of them, is he of opinion that one, which he does not know, is another thing which he does not know; or, knowing one and not the other, does he think that the one he does not know is the one he knows; or that the one he knows is the one he does not know? Or will you go on and tell me that there are kinds of knowledge of the kinds of knowledge and of ignorance, and that he who possesses these kinds of knowledge and has enclosed them in some sort of other ridiculous aviaries or waxen figments, knows them, so long as he possesses them, even if he has them not at hand in his soul? And in this fashion are you going to be compelled to trot about endlessly in the same circle without making any progress? What shall we reply to this, Theaetetus?
THEAET. By Zeus, Socrates, I don’t know what to say.
SOC. Then, my boy, is the argument right in rebuking us and in pointing out that we were wrong to abandon knowledge and seek first for false opinion? It is impossible to know the latter until we have adequately comprehended the nature of knowledge.
THEAET. As the case now stands, Socrates, we cannot help thinking as you say.
SOC. To begin, then, at the beginning once more, what shall we say knowledge is? For surely we are not going to give it up yet, are we?
THEAET. Not by any means, unless, that is, you give it up.
SOC. Tell us, then, what definition will make us contradict ourselves least.
THEAET. The one we tried before, Socrates; at any rate, I have nothing else to offer.
SOC. What one?
THEAET. That knowledge is true opinion; for true opinion is surely free from error and all its results are fine and good.