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Discourse on the Method

1637 · by René Descartes

Four rules of thought and the first “I think, therefore I am”.

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Introduction

The Discourse appeared anonymously in Leiden in 1637, in French, as the preface to three scientific essays: on optics, on meteorology and on geometry, the last of which laid the basis of analytic geometry. Its six parts read partly as an intellectual autobiography: a critique of his schooling, the four rules of method, a provisional morality for life during doubt, the outlines of his metaphysics, a summary of his physics including the idea of animals as machines, and reasons for publishing. Descartes chose French so that people could judge with their natural reason rather than relying on the authority of old books.

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  • Essays1580 · Michel de Montaigne

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