Descartes Existence of God Rene Descartes lived from 1596-1650; he was a rationalist who wrote a book named, Meditations on First Philosophy. ... He first said an idea must have a cause, next he said that the cause must be as real as the effect of the cause. ... Descartes presupposition is that everyone who reads his meditations is people who believe in the existence of God and that he is perfect. ... Hume Descartes lived from 1596-1650; he was a rationalist who wrote a book named Meditations on First Philosophy. ... In his first meditation, Descartes challenged the idea of certainty. ...

• Word Count: 1300
• Approx Pages: 5
• Grade Level: High School