 Although the idea that God is the creator of the world of individual existing things (Descartes) or that God himself is manifested in every individual existing thing (Spinoza) might already be considered to be sufficient as a motivating force for subsequent disputes as to the true nature of reality and thus might have given rise to what were then called “idealistic” positions in ontology, other peculiarities within Descartes’ and Spinoza’s position might well have led to the same result, i.e., to the adoption of idealism on ontological grounds. Especially their disagreement about God’s corporeality might have been such a motive. Whereas Descartes vigorously denies the corporeality of God (Principles of Philosophy I, 23) and hence could be seen as endorsing idealism, Spinoza vehemently insists on God’s corporeality (Ethics I, Proposition XV, Scholium) and thus could be taken to be in favor of materialism.