Founded in the mid-17th century, Rationalism was philosophy's first step into the modern era. This volume contains the essential statements of Rationalism's three greatest figures: Descartes, who began it; Spinoza, who epitomized it; and Leibniz, who gave it its last serious expression.

"In this sterling, deeply researched study, Williams explores how thinkers ranging from Hobbes to d'Holbach highlight various sets of ideas that Rousseau combated in developing his philosophical teaching. The account of Rousseau's predecessors who might be called Platonists is especially interesting, as is the account of those who qualify as materialists. Moreover, Williams provides a good overview of Rousseau's teaching, demonstrates a commendable grasp of the relevant secondary literature, and argues ably for the superiority of his own interpretations ... Clearly written and superbly organized, this book contributes much to Rousseau studies. An indispensable book for Rousseau scholars, this volume also will appeal to general readers and students at all levels."--C.E. Butterworth, CHOICE.

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Rene Descartes was a French philosopher and writer who spent most of his adult life in the Dutch Republic. He has been dubbed the 'Father of Modern Philosophy', and much subsequent Western philosophy is a response to his writings, which are studied closely to this day. In particular, his Meditations on First Philosophy continues to be a standard text at most university philosophy departments. Descartes's influence in mathematics is equally apparent; the Cartesian coordinate system, allowing geometric shapes to be expressed in algebraic equations, was named after him. He is credited as the father of analytical geometry. Descartes was also one of the key figures in the Scientific Revolution. Descartes frequently sets his views apart from those of his predecessors. In the opening section of the Passions of the Soul, a treatise on the Early Modern version of what are now commonly called emotions, Descartes goes so far as to assert that he will write on this topic "as if no one had written on these matters before." Many elements of his philosophy have precedents in late Aristotelianism, the revived Stoicism of the 16th century, or in earlier philosophers like St. Augustine. In his natural philosophy, he differs from the Schools on two major points: First, he rejects the analysis of corporeal substance into matter and form; second, he rejects any appeal to ends, divine or natural, in explaining natural phenomena. In his theology, he insists on the absolute freedom of God's act of creation. Descartes was a major figure in 17th century continental rationalism, later advocated by Baruch Spinoza and Gottfried Leibniz, and opposed by the empiricist school of thought consisting of Hobbes, Locke, Berkeley, Jean-Jacques Rousseau, and Hume. Leibniz, Spinoza and Descartes were all well versed in mathematics as well as philosophy, and Descartes and Leibniz contributed greatly to science as well. As the inventor of the Cartesian coordinate system, Descartes founded analytic geometry, the bridge between algebra and geometry, crucial to the discovery of infinitesimal calculus and analysis. He is perhaps best known for the philosophical statement "Cogito ergo sum" (French: Je pense, donc je suis; English: I think, therefore I am; or I am thinking, therefore I exist or I do think, therefore I do exist), found in part IV of Discourse on the Method.

"...there is nothing elementary about O'Grady's primer. She pulls off the feat of writing a reliable and accessible introduction to modern philosophy that is also a meaningful contribution to the subject." - Times Literary Supplement From Descartes' famous line 'I think therefore I am' to Kant's fascinating discussions of morality, the thinkers of the Enlightenment have helped to shape the modern world. Addressing such important subjects as the foundations of knowledge and the role of ethics, the theories of these philosophers continue to have great relevance to our lives. Ranging across Enlightenment thinking from Berkeley to Rousseau, Enlightenment Philosophy in a Nutshell explains important ideas such as Locke's ideas of primary and secondary qualities, Kant's moral rationalism, and Hume's inductive reasoning. Filled with helpful diagrams and simple summaries of complex theories, this essential introduction brings the great ideas of the past to everyone. ABOUT THE SERIES: The 'Knowledge in a Nutshell' series by Arcturus Publishing provides engaging introductions to many fields of knowledge, including philosophy, psychology and physics, and the ways in which human kind has sought to make sense of our world.

“Between the earliest and the latest of the works included here, we have two hundred and fifty years of vigorous and adventurous philosophizing,” Monroe Beardsley writes in his Introduction to this collection. “If the modern period can be only vaguely or arbitrarily bounded, it can at least be studied, and we can ask whether any dominant themes, overall patterns of movement, or notable achievements can be found within it. This question is one that is best asked by the reader after he has read, or read around in, these works.” This Modern Library Paperback Classic also includes a newly updated Bibliography.