 But if this is right, then “motion and rest” of the physical interlude cannot simply be the ordinary motion and rest of bodies. What then are they? Klever waxes vague and anachronistic here, straightaway seeking to validate his claim rhetorically by citing it as precedent of the view of contemporary physics: “in this reversal [Spinoza] anticipates modern physics by which mass is considered as product of energy” (ibid). (Hampshire (1987) contains similar remarks).