To maintain that it has come to be and ceased to be there will involve the consequence that A in the course of its locomotion will always be coming to a stand; for it is impossible that A should simultaneously have come to be at and ceased to be there, so that the two things must have happened at different points of time, and therefore there will be the intervening period of time: consequently A will be in a state of rest at, and similarly at all other points, since the same reasoning holds good in every case.