 An intriguing shift in the language Spinoza uses in the PCP to articulate the Cartesian laws of motion is suggestive of how Spinozistic and Cartesian inertia may differ. In PCP IIp16, Spinoza states “every body which moves in a circle, as for example, a stone in a sling, is continuously determined to go on moving along a tangent.” The immediately succeeding proposition, PCP IIp17, states, “Every body that moves in a circle strives to move away from the center of the circle that it describes” (emphasis added). Spinoza has substituted “strives” for “is continuously determined to do”, the Latin “conari” for the “tendere” of PCP IIp16, which is what Descartes had used in expressing his own version of the law of centrifugal motion. This substitution arguably involves a shift in dynamical implication. Conari usually has the sense of the English “exertion”, “effort” “undertaking”, or “impulse”; reading conari in accord with this usual sense, PCP IIp17 not only describes what a body moving circularly will do when it is not compelled by an external cause, but attributes that action to the effort or impulse of the moving body. PCP IIp17's invocation of conari, if we read it in this active sense, signals an ongoing effort, a continuous directedness, in this case, at homeostasis.