Discourse on the Method of Rightly Conducting the Reason, and Seeking Truth in the Sciences

The 'Discourse on the Method' is a philosophical and mathematical treatise published by René Descartes in 1637. Its full name is Discourse on the Method of Rightly Conducting the Reason, and Searching for Truth in the Sciences. The Discourse on Method is best known as the source of the famous quotation "Je pense, donc je suis", "I think, therefore I am".

This is one of the most influential works in the history of modern science.