Heracleitean of the fourth century B.C., on the nature of language been
preserved to us; or if we had lived at the time, and been 'rich enough to
attend the fifty-drachma course of Prodicus,' we should have understood
Plato better, and many points which are now attributed to the extravagance
of Socrates' humour would have been found, like the allusions of
Aristophanes in the Clouds, to have gone home to the sophists and
grammarians of the day.

For the age was very busy with philological speculation; and many questions
were beginning to be asked about language which were parallel to other
questions about justice, virtue, knowledge, and were illustrated in a
similar manner by the analogy of the arts. Was there a correctness in
words, and were they given by nature or convention? In the presocratic
philosophy mankind had been striving to attain an expression of their
ideas, and now they were beginning to ask themselves whether the expression
might not be distinguished from the idea? They were also seeking to
distinguish the parts of speech and to enquire into the relation of subject
and predicate. Grammar and logic were moving about somewhere in the depths
of the human soul, but they were not yet awakened into consciousness and
had not found names for themselves, or terms by which they might be
expressed. Of these beginnings of the study of language we know little,
and there necessarily arises an obscurity when the surroundings of such a
work as the Cratylus are taken away. Moreover, in this, as in most of the
dialogues of Plato, allowance has to be made for the character of Socrates.
For the theory of language can only be propounded by him in a manner which
is consistent with his own profession of ignorance. Hence his ridicule of
the new school of etymology is interspersed with many declarations 'that he
knows nothing,' 'that he has learned from Euthyphro,' and the like. Even
the truest things which he says are depreciated by himself. He professes
to be guessing, but the guesses of Plato are better than all the other