Descartes' Method to Attain Certain Knowledge. This paper examines how Descartes used the method of putting everything into doubt in order to attain certain knowledge. The first truth he discovered from this method was that perception and experience could not confirm knowledge, but that the significance of an innate idea could. In this exercise, Descartes was able to eliminate the argument that the senses and experiences were humans' sources of knowledge. 6 pgs. Bibliography lists 3 sources. Pages: 6 Bibliography: 3 source(s) listed Filename: 4644 Descartes Attain Knowledge.doc Price: 53.70