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body of the world now is; and yet it could be there, otherwise it would not be there now. Therefore before the world there was a vacuum; which is impossible.
Obj. 5: Further, nothing begins anew to be moved except through either the mover or the thing moved being otherwise than it was before. But what is otherwise now than it was before, is moved. Therefore before every new movement there was a previous movement. Therefore movement always was; and therefore also the thing moved always was, because movement is only in a movable thing.
Obj. 6: Further, every mover is either natural or voluntary. But neither begins to move except by some pre-existing movement. For nature always moves in the same manner: hence unless some change precede either in the nature of the mover, or in the movable thing, there cannot arise from the natural mover a movement which was not there before. And the will, without itself being changed, puts off doing what it proposes to do; but this can be only by some imagined change, at least on the part of time. Thus he who wills to make a house tomorrow, and not today, awaits something which will be tomorrow, but is not today; and at least awaits for today to pass, and for tomorrow to come; and this cannot be without change, because time is the measure of movement. Therefore it remains that before every new movement, there was a previous movement; and so the same conclusion follows as before.
Obj. 7: Further, whatever is always in its beginning, and always in its end, cannot cease and cannot begin; because what begins is not in its end, and what ceases is not in its beginning. But time always is in its beginning and end, because there is no time except "now" which is the end of the past and the beginning of the future. Therefore time cannot begin or end, and consequently neither can movement, the measure of what is