STRANGER: Then we must admit the other as the fifth of our selected classes.
THEAETETUS: Yes.
STRANGER: And the fifth class pervades all classes, for they all differ from one another, not by reason of their own nature, but because they partake of the idea of the other.
THEAETETUS: Quite true.
STRANGER: Then let us now put the case with reference to each of the five.
THEAETETUS: How?
STRANGER: First there is motion, which we affirm to be absolutely 'other' than rest: what else can we say?
THEAETETUS: It is so.
STRANGER: And therefore is not rest.
THEAETETUS: Certainly not.