Sophist

by Plato

THEAETETUS: True.

STRANGER: And thence arises the question, whether not-being mingles with opinion and language.

THEAETETUS: How so?

STRANGER: If not-being has no part in the proposition, then all things must be true; but if not-being has a part, then false opinion and false speech are possible, for to think or to say what is not—is falsehood, which thus arises in the region of thought and in speech.

THEAETETUS: That is quite true.

STRANGER: And where there is falsehood surely there must be deceit.

THEAETETUS: Yes.

STRANGER: And if there is deceit, then all things must be full of idols and images and fancies.

THEAETETUS: To be sure.

STRANGER: Into that region the Sophist, as we said, made his escape, and, when he had got there, denied the very possibility of falsehood; no one, he argued, either conceived or uttered falsehood, inasmuch as not-being did not in any way partake of being.