Plato, Theaetetus, section 171b

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[171b]

Socrates
Then would he not be conceding that his own opinion is false, if he grants that the opinion of those who think he is in error is true?

Theodorus
Necessarily.

Socrates
But the others do not concede that they are in error, do they?

Theodorus
No, they do not.

Socrates
And he, in turn, according to his writings, grants that this opinion also is true.

Theodorus
Evidently.

Socrates
Then all men, beginning with Protagoras, will dispute—or rather, he will grant, after he once concedes that the opinion of the man who holds the opposite view is true—even Protagoras himself, I say,

Plato. Plato in Twelve Volumes, Vol. 12 translated by Harold N. Fowler. Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1921.

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