Explanation:

Rene Descartes (1596-1650), a French philosopher, widely regarded as the ‘Father of Modern Philosophy.’ He began his career as a soldier but devoted his leisure hours to philosophizing. In an age of uncertainty, he made a new beginning by discarding the traditional scholastic methodology and beginning with the one fact that he could be certain of – the fact that he was thinking. From this, he concluded that his own existence was also a certainty. His well known saying is ‘cogito, ergo sum’ (‘I think, therefore I am’). Proceeding in this manner, he built his entire philosophy using a mathematical style of reasoning