 Individual bodies have an inherent stability, or robustness. They resist destructive incursion or change in their distinctive mode of endurance; they tend to persist in their configuration and motion in the face of opposition to this persistence. Spinoza certainly accepts this, as PID and IIIp6 show. If bodies either are, or are appearances of, persistent patterns of qualitative variation of extended regions, then it seems necessary, though hardly sufficient, that something about such patterns would have to account for this stability. But what might do so? In effect, this is to ask what would account for the fact that distributions of “motion” and “rest”, conceived of as predicates of extended regions, do not vary randomly through time. One suggestion is that nothing accounts for this stability at all, and that the duration of a body is nothing more than the time through which a given complex ratio of motion and rest happens, de facto, to characterize regions of extension whose sum over time describes what can be construed as a continuous path. There is nothing to prevent such spatiotemporally continuous patterns from occurring. But there is nothing in being a time slice of such a pattern that explains why the same pattern should also characterize any other spatiotemporal region continuous with it. There may, indeed must, be kinematic 'laws' describing how such patterns vary (the scare quotes cause the counterfactual supporting status of such 'laws' would be secured only by Spinoza's necessitarianism), but nothing about any given time slice of such patterns accounts for the fact that they are subject to just those descriptive 'laws'. Individual time-slices of such patterns would be wholly passive with respect to the persistence and trajectory of the pattern as a whole.