The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Theaetetus by Plato: things;' and then who is to decide? Upon his own showing must not his
'truth' depend on the number of suffrages, and be more or less true in
proportion as he has more or fewer of them? And he must acknowledge
further, that they speak truly who deny him to speak truly, which is a
famous jest. And if he admits that they speak truly who deny him to speak
truly, he must admit that he himself does not speak truly. But his
opponents will refuse to admit this of themselves, and he must allow that
they are right in their refusal. The conclusion is, that all mankind,
including Protagoras himself, will deny that he speaks truly; and his truth
will be true neither to himself nor to anybody else.
Theodorus is inclined to think that this is going too far. Socrates
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