Descartes' Ontological Argument: From Radical Doubt to the Existence of a Supreme Being
Descartes' Ontological Argument: From Radical Doubt to the Existence of a Supreme Being Descartes’ argument is grounded in what is predicated of God. For example, the predicate of existence is derived from idea of a supremely perfect being and such a being must have the predicate of being a necessary existence. Descartes often compares his ontological argument to a geometric demonstration by arguing that necessary existence cannot be excluded from idea of God any more than having three sides can be excluded from the idea of a triangle. Therefore, the existence of God is ‘a priori’ for Descartes, or is axiomatic, or known without experience. It seems like it is a counterfactual dependence, or by definition. For example, if one has a pair of birds, it is by definition that if there is one bird, there must be another to complete the pair. In the same way, if there is a supremely perfect being, it must have the predicate of necessary existence otherwise there would be a ...