Letters on the English author of "Novum Organum" and father of experimental philosophy. Letter 13 is about John Locke and his theories on the immortality of the soul. Letter 14 compares British philosopher Isaac Newton to French philosopher René Descartes. Upon his death in 1727, Newton was compared to Descartes in a eulogy performed by French philosopher Fontenelle. While the British did not appreciate this comparison, Voltaire argues that Descartes, too, was a great philosopher and mathematician. Letter 15 focuses on Newton's law of universal gravitation. Letter 16 talks about Newton's work with optics. Letter 17 discusses Newton's work with geometry and his theories
On the Harmony of Religions and Philosophy On the Harmony of Religions and Philosophy Fasl al-Maqal fi ma bayn al-Hikma wa al-Shariah min Ittisal (Arabic: "فصل المقال في ما بين الحكمة و الشريعة من إتصال" often translated as On the Harmony of Religions and Philosophy or The Decisive Treatise, Determining the Nature of the Connection between Religion and Philosophy, with the latter often shortened to The Decisive Treatise) is an Islamic philosophical treatise written by Andalusian Muslim polymath and philosopher Ibn Rushd (Averroes) (1126–1198), in which the author "critically examine[s] the alleged tension between philosophy and religion" and concludes that philosophy (in particular, Aristotelian philosophy) is not