Rene Descartes (1569-1650), the 'father' of modern philosophy, is without doubt one of the greatest thinkers in history: his genius lies at the core of our contemporary intellectual identity. Breaking with the conventions of his own time and suffering persecution by the Church as a consequence, Descartes in his writings - most of which are philosophical classics - attempted to answer the central questions surrounding the self, God, free-will and knowledge, using the science of thought as opposed to received wisdom based on the tenets of faith.