Rene Descartes 
Discourse on Method and Meditations on First Philosophy [EPUB ebook] 

Contained here are two of the most important philosophy works ever written, Descartes’ 'Discourse on the Method of Rightly Conducting the Reason and Seeking for Truth in the Sciences’ and 'Meditations on First Philosophy.’ Descartes, who is considered to be one of the founding fathers of modern philosophy, lays forth the basics of his philosophy and expounds upon such monumental issues as the nature of knowledge and existence itself in these two important and pivotal works.