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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Theaetetus by Plato: Socrates of Plato, with the real person.
Returning then to the Theaetetus, as the only possible source from which an
answer to these questions can be obtained, we may remark, that Plato had
'The Truth' of Protagoras before him, and frequently refers to the book.
He seems to say expressly, that in this work the doctrine of the
Heraclitean flux was not to be found; 'he told the real truth' (not in the
book, which is so entitled, but) 'privately to his disciples,'--words which
imply that the connexion between the doctrines of Protagoras and
Heracleitus was not generally recognized in Greece, but was really
discovered or invented by Plato. On the other hand, the doctrine that 'Man
is the measure of all things,' is expressly identified by Socrates with the
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