It cannot.
Then the one, if it is not, cannot turn in that in which it is not?
No.
Neither can the one, whether it is or is not, be altered into other than itself, for if it altered and became different from itself, then we could not be still speaking of the one, but of something else?
True.
But if the one neither suffers alteration, nor turns round in the same place, nor changes place, can it still be capable of motion?
Impossible.
Now that which is unmoved must surely be at rest, and that which is at rest must stand still?
Certainly.
Then the one that is not, stands still, and is also in motion?