THEAETETUS: What sentence?
STRANGER: 'Theaetetus, with whom I am now speaking, is flying.'
THEAETETUS: That also is a sentence which will be admitted by every one to speak of me, and to apply to me.
STRANGER: We agreed that every sentence must necessarily have a certain quality.
THEAETETUS: Yes.
STRANGER: And what is the quality of each of these two sentences?
THEAETETUS: The one, as I imagine, is false, and the other true.
STRANGER: The true says what is true about you?
THEAETETUS: Yes.
STRANGER: And the false says what is other than true?