STRANGER: Then we may infer that being is not, in respect of as many other things as there are; for not-being these it is itself one, and is not the other things, which are infinite in number.
THEAETETUS: That is not far from the truth.
STRANGER: And we must not quarrel with this result, since it is of the nature of classes to have communion with one another; and if any one denies our present statement [viz., that being is not, etc.], let him first argue with our former conclusion [i.e., respecting the communion of ideas], and then he may proceed to argue with what follows.
THEAETETUS: Nothing can be fairer.
STRANGER: Let me ask you to consider a further question.
THEAETETUS: What question?
STRANGER: When we speak of not-being, we speak, I suppose, not of something opposed to being, but only different.
THEAETETUS: What do you mean?
STRANGER: When we speak of something as not great, does the expression seem to you to imply what is little any more than what is equal?
THEAETETUS: Certainly not.