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Philosophical Works

René Descartes

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René Descartes is spoken of as the father of modern philosophy, and his seventeenth-century contributions to the discipline as the most significant since Aristotle. While in his lifetime he was primarily known as a mathematician and scientific theorist—in contemporaneous terms a “natural philosopher”—the works of his that we’d today consider to be philosophy are those that continue to command attention. Of these, collected here are the “Discourse on the Method of Rightly Conducting One’s Reason and of Seeking Truth in the Sciences,” the “Meditations on the First Philosophy,” and selections from the “Principles of Philosophy.”

The “Discourse on the Method” was first published as a lengthy introduction to treatises on optics, meteorology, and geometry, in which the titular method of seeking truth in the sciences was applied. Unlike Descartes’ other major works, it was originally composed in French in the hope of reaching a wider audience than scholarly Latin would allow. It’s written in the first person, and Descartes introduces it as a sort of intellectual autobiography. In the second part he outlines the method for right ratiocinative conduct in the form of four precepts; later parts cover issues in morality, metaphysics, medicine, and scientific progress in general.

In the “Meditations on the First Philosophy” Descartes takes up the metaphysical issues he says were only touched on “in passing” in the “Discourse,” namely “the existence of God and the nature of the human soul,” including what it can and cannot doubt. In the second Meditation he arrives at his most famous idea, which he’d later call the “first principle” of his thought, a proposition he argues is indubitable: “cogito ergo sum”—“I think, therefore I am.” From the cogito he goes on to deduce the existence of God and God’s non-deceiving nature—and then from these two conclusions, eventually the distinction between mind and body and the existence of material objects, foundations on which all other truths about the world may be based.

Descartes’ arguments in the “Meditations” were controversial—the book was originally published with objections from seven of his contemporaries, and his replies to them—but its reputation remains that of one of the finest pieces of philosophical writing ever produced, and it’s still in wide use today as an introduction to philosophy. His discussion of the mind-body distinction in the “Meditations” is perhaps the most influential treatment of the subject since Plato, even if “Cartesian dualism” now functions as a pejorative. His solutions have since been rejected, but the problem he raised is still considered a problem.

The “Principles of Philosophy,” written after both the “Discourse” and “Meditations,” was intended as a textbook to replace the textbooks of Aristotelian philosophy. Of the latter, Descartes wrote in the preface that “the more [people] have studied it, the less fit are they for rightly apprehending the truth.” In this work, short numbered paragraphs provide a systematic overview of his metaphysics and natural philosophy, which departed methodologically from that tradition, with—he claimed—salutary effects: “those imbued with my doctrines have much less difficulty in comprehending the writings of others, and estimating their true value, than those who have not been so imbued.”

Descartes’ legacy is enormous; as translator John Veitch put it, his philosophy is “a sort of crossroad whence diverge the chief ways followed by modern thought.” Later major figures of Western philosophy from Hume and Kant to Wittgenstein and Williams have thought it necessary either to engage with his project or mark the contrast between theirs and his. While Descartes’ rationalist “project of pure enquiry” is not generally considered a live option in modern epistemology, his writing continues to serve as a model of lucidity in thought and argumentation.

This edition includes as an appendix an excerpt from Descartes’ replies to the second set of objections, and some endnotes by translator John Veitch discussing key terms used by Descartes such as “idea” (in general and of the “innate” variety), “perception,” “pure intellection,” and “motion.”

Descartes entreats his readers in the synopsis of the “Meditations” not to form any judgment about the questions the work raises without having read the Objections and his corresponding Replies; unfortunately, the Objections and Replies were not translated in full into English until the early twentieth century and will enter the U.S. public domain only in 2030.

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