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
Youssef Seddik (philosopher) Youssef Seddik (philosopher) Youssef Seddik () (born in 1943 in Tozeur) is a noted Tunisian philosopher and anthropologist specializing in Ancient Greece and the anthropology of the Qur'an. In 1966, he obtained a master's degree in philosophy and a degree in French literature and civilization. During the next four years, he taught at the French school in Compiègne in 1967 and obtained a DES ("", roughly equivalent to an MA) in Philosophy and a degree in Ancient Greece. From 1971 to 1977 he taught philosophy in secondary schools in Tunisia and at the , before becoming director of a publishing