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The Cartesian Method is the philosophical and scientific system of René Descartes and its subsequent development by other seventeenth century thinkers, most notably François Poullain de la Barre, Nicolas Malebranche and Baruch Spinoza. Descartes is often regarded as the first thinker to emphasize the use of reason to develop the natural sciences. For him, philosophy was a thinking system that embodied all knowledge.
Aristotle and St. Augustine’s work influenced Descartes's cogito argument.[failed verification] Additionally, there is similarity between Descartes’s work and that of the Scottish philosopher, George Campbell’s 1776 publication, titled Philosophy of Rhetoric.  In his Meditations on First Philosophy he writes, "[b]ut what then am I? A thing which thinks. What is a thing which thinks? It is a thing which doubts, understands, [conceives], affirms, denies, wills, refuses, which also imagines and feels."
Cartesians view the mind as being wholly separate from the corporeal body. Sensation and the perception of reality are thought to be the source of untruth and illusions, with the only reliable truths to be had in the existence of a metaphysical mind. Such a mind can perhaps interact with a physical body, but it does not exist in the body, nor even in the same physical plane as the body. The question of how mind and body interact would be a persistent difficulty for Descartes and his followers, with different Cartesians providing different answers. To this point Descartes wrote, "we should conclude from all this, that those things which we conceive clearly and distinctly as being diverse substances, as we regard mind and body to be, are really substances essentially distinct one from the other; and this is the conclusion of the Sixth Meditation." Therefore, we can see that, while mind and body are indeed separate, because they can be separated from each other, but, Descartes realizes, the mind is a whole, inseparable from itself, while the body can become separated from itself to some extent, as in when one loses an arm or a leg.
Descartes held that all existence consists in three distinct substances, each with its own essence:
- matter, possessing extension in three dimensions
- mind, possessing self-conscious thought
- God, possessing necessary existence
Descartes brought the question of how reliable knowledge may be obtained (epistemology) to the fore of philosophical enquiry. Many consider this to be Descartes' most lasting influence on the history of philosophy.
Cartesianism is a form of rationalism because it holds that scientific knowledge can be derived a priori from 'innate ideas' through deductive reasoning. Thus Cartesianism is opposed to both Aristotelianism and empiricism, with their emphasis on sensory experience as the source of all knowledge of the world.
In the Netherlands, where Descartes had lived for a long time, Cartesianism was a doctrine popular mainly among university professors and lecturers. In Germany the influence of this doctrine was not relevant and followers of Cartesianism in the German-speaking border regions between these countries (e.g., the iatromathematician Yvo Gaukes from East Frisia) frequently chose to publish their works in the Netherlands. In France, it was very popular, and gained influence also among Jansenists such as Antoine Arnauld, though there also, as in Italy, it became opposed by the Church. In Italy, the doctrine failed to make inroads, probably since Descartes' works were placed on the Index Librorum Prohibitorum in 1663.
In England, because of religious and other reasons, Cartesianism was not widely accepted. Though Henry More was initially attracted to the doctrine, his own changing attitudes toward Descartes mirrored those of the country: "quick acceptance, serious examination with accumulating ambivalence, final rejection."
- Antoine Arnauld
- Balthasar Bekker
- Tommaso Campailla
- Johannes Clauberg
- Michelangelo Fardella
- Antoine Le Grand
- Adriaan Hereboord
- Nicolas Malebranche
- François Poullain de la Barre
- Edmond Pourchot
- Pierre-Sylvain Régis
- Henricus Regius
- Jacques Rohault
- Christopher Wittich
- Caird 1911, p. 414.
- Grosholz, Emily (1991). Cartesian method and the problem of reduction. Oxford University Press. ISBN 0-19-824250-6.
But contemporary debate has tended to...understand [Cartesian method] merely as the 'method of doubt'...I want to define Descartes's method in broader terms...to trace its impact on the domains of mathematics and physics as well as metaphysics.
- Descartes, René; Translator John Veitch. "Letter of the Author to the French Translator of the Principles of Philosophy serving for a preface". Retrieved August 2013. Check date values in:
- Steup, Matthias (2018), Zalta, Edward N. (ed.), "Epistemology", The Stanford Encyclopedia of Philosophy (Winter 2018 ed.), Metaphysics Research Lab, Stanford University, archived from the original on 22 September 2019, retrieved 17 April 2019
- "BBC Radio 4 - In Our Time, Cogito Ergo Sum". BBC. Retrieved 17 April 2019.
- Descartes, Rene (1996). Meditations on First Philosophy. http://selfpace.uconn.edu/class/percep/DescartesMeditations.pdf: Internet Encyclopedia of Philosophy. p. 10.
- "Cartesianism | philosophy". Encyclopædia Britannica. Retrieved 27 January 2016.
- Ree, Jonathan (1991). The Concise Encyclopedia of Western Philosophy and Philosophers. London: Routledge. p. 78. ISBN 0415078830.
- Ree, Jonathan (1991). The Concise Encyclopedia of Western Philosophy and Philosophers. London: Routledge. p. 75. ISBN 0415078830.
- Kelly, Anthony (2006). The Rise of Modern Philosophy. Oxford: Oxford University Press. p. 123. ISBN 9780198752769.
- Copleston, Frederick Charles (2003). A History of Philosophy, Volume 4. Continuum International. p. 174. ISBN 978-0-8264-6898-7.
- Lennon, Thomas M.; John M. Nicholas; John Whitney Davis (1982). Problems of Cartesianism. McGill-Queen's Press. p. 4. ISBN 978-0-7735-1000-5.
- Cristofolini, Paul; "Campailla, Thomas" in Biographical Dictionary of Italians - Volume 17 (1974), Istituto della Enciclopedia Italiana. Retrieved 30 September 2015
- Francisque Bouillier, Histoire de la philosophie cartésienne (2 volumes) Paris: Durand 1854 (reprint: BiblioBazaar 2010).
- Caird, Edward (1911). . In Chisholm, Hugh (ed.). Encyclopædia Britannica. 5 (11th ed.). Cambridge University Press. pp. 414–426. This contains along review of the principles of Cartesian philosophy.
- Eduard Jan Dijksterhuis, Descartes et le cartésianisme hollandais. Études et documents Paris: PUF 1951.
- Garrod, Raphaële; Marr, Alexander, eds. (2020). Descartes and the "Ingenium": The Embodied Soul in Cartesianism. Brill's Studies in Intellectual History. 323. Leiden: Brill Publishers. ISBN 978-90-04-43761-6. ISSN 0920-8607.
- Tad M. Schmaltz (ed.), Receptions of Descartes. Cartesianism and Anti-Cartesianism in Early Modern Europe New York: Routledge 2005.
- Richard A. Watson, The Downfall of Cartesianism 1673–1712. A Study of Epistemological Issues in Late 17th Century Cartesianism The Hague: Martinus Nijhoff 1966.