THEAETETUS: Quite true.
STRANGER: But the stream of thought which flows through the lips and is audible is called speech?
THEAETETUS: True.
STRANGER: And we know that there exists in speech...
THEAETETUS: What exists?
STRANGER: Affirmation.
THEAETETUS: Yes, we know it.
STRANGER: When the affirmation or denial takes Place in silence and in the mind only, have you any other name by which to call it but opinion?
THEAETETUS: There can be no other name.
STRANGER: And when opinion is presented, not simply, but in some form of sense, would you not call it imagination?