The same argument applies in each case, but with this difference: that if the states are two then it follows simply from this fact that the actuality must also in point of number be two (for only that which is numerically one can give rise to an actuality that is numerically one); but if the state is one, this is not in itself enough to make us regard the actuality also as one (for when a man ceases walking, the walking no longer is, but it will again be if he begins to walk again).