Jowett: conversation of the soul

Str. Are not thought and speech the same, with this exception, that what is called thought is the unuttered conversation of the soul with herself ? SOPHIST

Str. And seeing that language is true and false, and that thought is the conversation of the soul with herself, and opinion is the end of thinking, and imagination or phantasy is the union of sense and opinion, the inference is that some of them, since they are akin to language, should have an element of falsehood as well as of truth ? SOPHIST