Why, because the one, if it were moved, would be either moved in place or
changed in nature; for these are the only kinds of motion.

Yes.

And the one, when it changes and ceases to be itself, cannot be any longer
one.

It cannot.

It cannot therefore experience the sort of motion which is change of
nature?

Clearly not.

Then can the motion of the one be in place?

Perhaps.

But if the one moved in place, must it not either move round and round in
the same place, or from one place to another?

It must.

And that which moves in a circle must rest upon a centre; and that which
goes round upon a centre must have parts which are different from the
centre; but that which has no centre and no parts cannot possibly be
carried round upon a centre?

Impossible.