But we have in us the idea of God (by Definitions II and VIII ), and of this idea the objective reality is not contained in us, either forrnally or eminently (by Axiom VI ), nor can it be contained in any other except in God himself (by Definition VIII ).

Therefore this idea of God which is in us demands God for its cause, and consequently God exists (by Axiom III ).

Proposition III

The existence of God is also demonstrated from this, that we ourselves, who possess the idea of him, exist.

Demonstration