 Whether there is a sufficient Spinozistic ground for for a unified conception of the power of modes both to resist and to bring about changes in other modes of the the attribute under which they are considered remains an open question.  It seems likely, however, that reading the PI, the conatus doctrine, and Spinoza's accounts and justifications of inertia and the dynamical laws in the light of the fact that modes each express in their own way the infinite actvity and power of the one substance provides the best hope for illuminating such ground.  