Rene Descartes (1596-1650) was a French Philosopher, Mathematician, and scientist, widely regarded as the "Father Of modern Philosophy". His ideas have left a profound and lasting influence on western Philosophy, Science and Mathematics. So, the critics were of the opinion that his method of radical doubt was an attack on traditional beliefs, and church. So, in his "Meditations on the first Philosophy” that was written in 1641, he stressed the need of six meditations that reconcile reason with faith to explore the nature of the self, the existence of God and the distinction between mind and body. In the 'Preface to the Reader' of this book Descartes talks about the existence of God and the soul.