[171c]
will concede that neither a dog nor any casual man is a measure of anything whatsoever that he has not learned. Is not that the case?
Theodorus
Yes.
Socrates
Then since the “truth” of Protagoras is disputed by all, it would be true to nobody, neither to anyone else nor to him.
Theodorus
I think, Socrates, we are running my friend too hard.
Socrates
But, my dear man, I do not see that we are running beyond what is right. Most likely, though, he, being older,