Rene Descartes' most widely read work is his ''Discourse on Method'' (in French, ''Discours de la methode''), published in 1637. There Descartes sets forth four rules for discovering knowledge: | Rene Descartes' most widely read work is his ''Discourse on Method'' (in French, ''Discours de la methode''), published in 1637. There Descartes sets forth four rules for discovering knowledge: |