Nevertheless, since each determination of matter that constitutes what is real in it, hence impenetrability too, is an effect (action) that must have its cause, and hence is always derivative, matter is not suited to the idea of a necessary being as the principle of all derivative unity, because each of its real properties as derivative is only conditionally necessary and hence can in itself be cancelled; but then the entire existence of matter would be cancelled; but if this did not happen, we would have reached the highest ground of unity empirically, which is forbidden by the second regulative principle;c