STRANGER: Then we may without fear contend that motion is other than being?
THEAETETUS: Without the least fear.
STRANGER: The plain result is that motion, since it partakes of being, really is and also is not?
THEAETETUS: Nothing can be plainer.
STRANGER: Then not-being necessarily exists in the case of motion and of every class; for the nature of the other entering into them all, makes each of them other than being, and so non-existent; and therefore of all of them, in like manner, we may truly say that they are not; and again, inasmuch as they partake of being, that they are and are existent.
THEAETETUS: So we may assume.
STRANGER: Every class, then, has plurality of being and infinity of not-being.
THEAETETUS: So we must infer.
STRANGER: And being itself may be said to be other than the other kinds.
THEAETETUS: Certainly.