Benedict De Spinoza vs. Rene Descartes In Spinoza's view God is a substance that includes eternal attributes and their necessity. One of the proofs for existence of such a substance is that something does not exist if and only if something else prevents its existence. For example, people walk on earth instead of flying on it, because there are rules of gravity that prevent people from flying on earth. Gravity influences everything, which is on earth's surface, thus preventing us humans to fly. Because God is an eternal being consisting o ....