During the first quarter of the twentieth century, the French philosopher Henri Bergson became an international celebrity, profoundly influencing contemporary intellectual and artistic currents. While Bergsonism was fashionable, L. Susan Stebbing, Bertrand Russell, Moritz Schlick, and Rudolf Carnap launched different critical attacks against some of Bergson's views. This book examines this series of critical responses to Bergsonism early in the history of analytic philosophy. Analytic criticisms of Bergsonism were influenced by William James, who saw Bergson as an 'anti-intellectualist' ally of American Pragmatism, and Max Scheler, who saw him as a prophet of Lebensphilosophie. Some of the main analytic objections to Bergson are answered in the work of Karin Costelloe-Stephen. Analytic anti-Bergsonism accompanied the earlier refutations of idealism by Russell and Moore, and later influenced the Vienna Circle's critique of metaphysics. It eventually contributed to the formation of the view that 'analytic' philosophy is divided from its 'continental' counterpart.

Baruch Spinoza’s Ethics is a dense masterpiece of sustained argumentative reasoning. It earned its place as one of the most important and influential books in Western philosophy by virtue of its uncompromisingly direct arguments about the nature of God, the universe, free will, and human morals.

Though it remains one of the densest and most challenging texts in the entire canon of Western philosophy, Ethics is also famous for Spinoza’s unique approach to ordering and constructing its arguments. As its full title – Ethics, Demonstrated in Geometrical Order – suggests, Spinoza decided to use the rigorous format of mathematical-style propositions to lay out his arguments, just as the Ancient Greek mathematician Euclid had used geometrical propositions to lay out the basic rules of geometry.

In choosing such a systematic method, Spinoza’s masterwork shows the crucial aspects of good reasoning skills being employed at the highest level. The key use of reasoning is the production of an argument that is well-organised, supports its conclusions and proceeds logically towards its end. Just as a mathematician might demonstrate a geometrical proof, Spinoza sought to lay out a comprehensive philosophy for human existence – an attempt that has influenced generations of philosophers since.

René Descartes’s 1641 Meditations on First Philosophy is a cornerstone of the history of western thought. One of the most important philosophical texts ever written, it is also a masterclass in the art of critical thinking – specifically when it comes to reasoning and interpretation.

Descartes sought to do nothing less than create a new foundation for the pursuit of knowledge – whether philosophical, scientific, or theological. To that end, he laid out a systematic programme that reinterpreted prior definitions of knowledge, and reasoned out a systematic means of obtaining, verifying, and building on existing human knowledge. To this end, Descartes created a definition of true knowledge as that which is based on things which cannot be called into doubt by radical scepticism. If, he suggests, we can find a belief that cannot be called into doubt, this will provide a solid foundation upon which we can build systematic reasoning. This ‘cartesian’ method, as it has come to be known, is a blueprint for reasoning that continues to shape the study of philosophy today: a careful weighing of possibilities, searching out solid ground and building on it step by step.

During the first quarter of the twentieth century, the French philosopher Henri Bergson became an international celebrity, profoundly influencing contemporary intellectual and artistic currents. While Bergsonism was fashionable, L. Susan Stebbing, Bertrand Russell, Moritz Schlick, and Rudolf Carnap launched different critical attacks against some of Bergson’s views. This book examines this series of critical responses to Bergsonism early in the history of analytic philosophy. Analytic criticisms of Bergsonism were influenced by William James, who saw Bergson as an ‘anti-intellectualist’ ally of American Pragmatism, and Max Scheler, who saw him as a prophet of Lebensphilosophie. Some of the main analytic objections to Bergson are answered in the work of Karin Costelloe-Stephen. Analytic anti-Bergsonism accompanied the earlier refutations of idealism by Russell and Moore, and later influenced the Vienna Circle’s critique of metaphysics. It eventually contributed to the formation of the view that ‘analytic’ philosophy is divided from its ‘continental’ counterpart.

Baruch Spinoza's Ethics is a dense masterpiece of sustained argumentative reasoning. It earned its place as one of the most important and influential books in Western philosophy by virtue of its uncompromisingly direct arguments about the nature of God, the universe, free will, and human morals. Though it remains one of the densest and most challenging texts in the entire canon of Western philosophy, Ethics is also famous for Spinoza's unique approach to ordering and constructing its arguments. As its full title - Ethics, Demonstrated in Geometrical Order - suggests, Spinoza decided to use the rigorous format of mathematical-style propositions to lay out his arguments, just as the Ancient Greek mathematician Euclid had used geometrical propositions to lay out the basic rules of geometry. In choosing such a systematic method, Spinoza's masterwork shows the crucial aspects of good reasoning skills being employed at the highest level. The key use of reasoning is the production of an argument that is well-organised, supports its conclusions and proceeds logically towards its end. Just as a mathematician might demonstrate a geometrical proof, Spinoza sought to lay out a comprehensive philosophy for human existence - an attempt that has influenced generations of philosophers since.

Rene Descartes's 1641 Meditations on First Philosophy is a cornerstone of the history of western thought. One of the most important philosophical texts ever written, it is also a masterclass in the art of critical thinking - specifically when it comes to reasoning and interpretation. Descartes sought to do nothing less than create a new foundation for the pursuit of knowledge - whether philosophical, scientific, or theological. To that end, he laid out a systematic programme that reinterpreted prior definitions of knowledge, and reasoned out a systematic means of obtaining, verifying, and building on existing human knowledge. To this end, Descartes created a definition of true knowledge as that which is based on things which cannot be called into doubt by radical scepticism. If, he suggests, we can find a belief that cannot be called into doubt, this will provide a solid foundation upon which we can build systematic reasoning. This 'cartesian' method, as it has come to be known, is a blueprint for reasoning that continues to shape the study of philosophy today: a careful weighing of possibilities, searching out solid ground and building on it step by step.