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Logic IV. 43
that bad men do not do what they desire, the good. In this dialogue is contained the famous myth of the Last Judgement. The argument against pleasure is that pleasure and pain are necessarily simultaneous. The idea which runs through the dialogue is that natural common sense notions as what is desireable are mostly false or in other words that the satisfaction of his instinctive desires in not a thing which an man who duly considered the matter would be content to wish. Since this dialogue was the first that Plato composed for his school we may infer that he considered that doctrine to be the most indespensible lesson he had to teach.
Aristotle tells us that the Heraclitan philosopher Ceratylus became the teacher of Plato and [Psoclus?] say that this is the Ceratylus of the next dialogue. It is also to be remembered that Plato with his wonderful gift of language would not have failed, during his travels to pick up some foreign speech, which would have awaked reflections in his mind. But that which