  William had read Aristotle's Physics and agrees with Aristotle that time and motion are coextensive (OO I, 700a). Yet he does not propose Aristotle's definition of time as the number of motion in respect of before and after. Rather, in his account of the essential nature of time he describes time simply as being that flows and does not last, “that is, it has nothing of itself that lasts in act or potency” (OO I, 683a; Teske 1998a, 102). Echoing Aristotle and Augustine, he holds that time has the weakest being, and that “of all things that are said to be in any way, time is the most remote from eternity, and this is because it only touches eternity by the very least of itself, the now itself or a point of time” (OO I, 748a).