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In 1637 Descartes published Optics, Meteorology, and Geometry, a collection of essays. The preface to the collection is titled Discourse on the Method of Rightly Conducting the Reason and Seeking Truth in the Sciences.

Descartes’ Discourse alters the course of philosophy, by starting first with a proof of the existence of the self — cogito ergo sum— and subsequently deducing from it the existence and nature of God. That is to say, he offers a radical modern account not only of the physical ...