 Hence, Sturm’s strategy achieves its goal: matter is causally passive, and material forms are passive as well. In order to account for the changes observed in nature, it is necessary to locate a source for causal activity. However, this source cannot be found anywhere in the natural world itself. God is thus the only candidate left to account for the causal active power needed to bring about natural phenomena. God’s power, however, is only responsible for the fact that natural phenomena are brought about. The specific reason why they are such and such is to be located in the specific features of passive forms themselves. In this respect, God’s involvement in nature plays only a metaphysical grounding function and it is not supposed to replace, but rather to justify, the need to carefully investigate the mechanical structures of passive forms.