STRANGER: And each of them is other than the remaining two, but the same with itself.
THEAETETUS: True.
STRANGER: But then, what is the meaning of these two words, 'same' and 'other'? Are they two new kinds other than the three, and yet always of necessity intermingling with them, and are we to have five kinds instead of three; or when we speak of the same and other, are we unconsciously speaking of one of the three first kinds?
THEAETETUS: Very likely we are.
STRANGER: But, surely, motion and rest are neither the other nor the same.
THEAETETUS: How is that?
STRANGER: Whatever we attribute to motion and rest in common, cannot be either of them.
THEAETETUS: Why not?
STRANGER: Because motion would be at rest and rest in motion, for either of them, being predicated of both, will compel the other to change into the opposite of its own nature, because partaking of its opposite.
THEAETETUS: Quite true.