René Descartes

Lore & Background

René Descartes was born in La Haye en Touraine, France, on 31 March 1596. His mother died in May 1597 shortly after giving birth to a stillborn child. He entered the Jesuit College of La Flèche in 1607, where he was introduced to mathematics and physics, and later studied at the University of Poitiers, earning a Baccalauréat and Licence in canon and civil law in 1616. In 1618, he joined the Protestant Dutch States Army as a mercenary, studying military engineering and becoming acquainted with Isaac Beeckman, for whom he wrote the Compendium of Music. While serving the Catholic Duke Maximilian of Bavaria in 1619, he was present at the Battle of the White Mountain. According to Adrien Baillet, on the night of 10–11 November 1619, Descartes had three dreams in a room with an oven, after which he formulated analytic geometry and the idea of applying the mathematical method to philosophy.

Descartes left the army in 1620, visited various countries, and returned to France, composing his first essay on method, Regulae ad Directionem Ingenii. In 1628, he returned to the Dutch Republic, where he wrote all his major work over more than twenty years. In 1633, after Galileo was condemned by the Italian Inquisition, Descartes abandoned plans to publish Treatise on the World. In 1637, he published parts of that work in three essays—'Les Météores', 'La Dioptrique', and La Géométrie—preceded by the Discours de la méthode. In 1641, he published Meditations on First Philosophy, followed in 1644 by Principles of Philosophy. In 1643, Cartesian philosophy was condemned at the University of Utrecht, forcing him to flee. He had a relationship with a servant girl, Helena Jans van der Strom, with whom he had a daughter, Francine, who died of scarlet fever at age five. Descartes wept upon her death, defending the expression of emotion. He corresponded with Princess Elisabeth of Bohemia and published The Passions of the Soul in 1649, dedicated to her.

Reader's Guide

Descartes's significance lies in his transformation of methodology in philosophy and his foundational contributions to mathematics. By refusing to accept the authority of previous philosophers and asserting that he would write on emotions 'as if no one had written on these matters before,' he established a systematic, method-based approach to knowledge. His statement 'cogito, ergo sum' became a cornerstone of modern philosophy. In mathematics, he connected geometry and algebra into analytic geometry, leading to the Cartesian coordinate system named after him, which facilitated the discovery of infinitesimal calculus and analysis. His works, including Meditations on First Philosophy and Discourse on the Method, continue to be studied. He was a key figure in the Scientific Revolution, and his influence extends across metaphysics, epistemology, ethics, philosophy of science, physics, optics, mechanics, cosmology, meteorology, physiology, and medicine. Despite condemnation of his philosophy at the University of Utrecht in 1643, his ideas persisted and shaped subsequent intellectual history.

Did You Know?

• Descartes's mother died in May 1597, a few days after giving birth to a stillborn child.
• He had a daughter, Francine, with servant girl Helena Jans van der Strom; Francine died of scarlet fever at age five.
• According to Adrien Baillet, Descartes had three dreams on the night of 10–11 November 1619 that led him to formulate analytic geometry.
• In 1643, Cartesian philosophy was condemned at the University of Utrecht, forcing Descartes to flee.

Notable Quotes (Wikiquote)

"Me tenant comme je suis, un pied dans un pays et l'autre en un autre, je trouve ma condition très heureuse, en ce qu'elle est libre." — René Descartes "Staying as I am, one foot in one country and the other in another, I find my condition very happy, in that it is free." — René Descartes "The entire method consists in the order and arrangement of the things to which the mind's eye must turn so that we can discover some truth." — René Descartes "As quoted in Clarke, Desmond M. (2006). Descartes : a Biography. Cambridge Press. p. 67. ISBN 978-0-521-82301-2." — René Descartes