Jean Jacques Rousseau was a Swiss philosopher and political theorist who lived much of his life in France. Many reference books describe him as French, but he generally added "Citizen of Geneva" whenever he signed his name. He presented his theory of education in Emile (1762), a novel, the first book to link the educational process to a scientific understanding of children; Rousseau is thus regarded as the precursor, if not the founder, of child psychology. "The greatest good is not authority, but liberty," he wrote, and in The Social Contract (1762) Rousseau moved from a study of the individual to an analysis of the relationship of the individual to the state: "The art of politics consists of making each citizen extremely dependent upon the polis in order to free him from dependence upon other citizens." This doctrine of sovereignty, the absolute supremacy of the state over its members, has led many to accuse Rousseau of opening the doors to despotism, collectivism, and totalitarianism. Others say that this is the opposite of Rousseau's intent, that the surrender of rights is only apparent, and that in the end individuals retain the rights that they appear to have given up. In effect, these Rousseau supporters say, the social contract is designed to secure or to restore to individuals in the state of civilization the equivalent of the rights they enjoyed in the state of nature. Rousseau was a passionate man who lived in passionate times, and he still stirs passion in those who write about him today.
François-Marie Arouet known as Voltaire, was born in Paris in 1694. He was educated by the Jesuits at the Collège Louis-le-Grand (1704-1711), where he learned Latin and Greek; later in life he became fluent in Italian, Spanish, and English. By the time he left school, Voltaire had decided he wanted to be a writer. His father then obtained a job for him as a secretary to the French ambassador in the Netherlands. Most of Voltaire's early life revolved around Paris. From early on, Voltaire had trouble with the authorities for critiques of the government and religious intolerance. These activities were to result in two imprisonments and a temporary exile to England. The name "Voltaire", which the author adopted in 1718, is an anagram of "AROVET LI," the Latinized spelling of his surname, Arouet, and the initial letters of "le jeune" ("the young"). The name also echoes in reverse order the syllables of the name of a family château in the Poitou region: "Airvault". The adoption of the name "Voltaire" following his incarceration at the Bastille is seen by many to mark Voltaire's formal separation from his family and his past. Voltaire continued to write plays, such as Mérope (or La Mérope française) and began his long research into science and history. From 1762, he began to champion unjustly persecuted people, the case of Jean Calas being the most celebrated. This Huguenot merchant had been tortured to death in 1763, supposedly because he had murdered his son for wanting to convert to Catholicism. His possessions were confiscated and his remaining children were taken from his widow and were forced to become members of a monastery. Voltaire, seeing this as a clear case of religious persecution, managed to overturn the conviction in 1765. n February 1778, Voltaire returned for the first time in 20 years to Paris. He soon became ill again and died on 30 May 1778.
Best known for the quote from his Meditations de prima philosophia, or Meditations on First Philosophy (1641), "I think therefore I am," philosopher and mathematician Rene Descartes also devoted much of his time to the studies of medicine, anatomy and meteorology. Part of his Discourse on the Method for Rightly Conducting One's Reason and Searching for the Truth in the Sciences (1637) became the foundation for analytic geometry. Descartes is also credited with designing a machine to grind hyperbolic lenses, as part of his interest in optics. Rene Descartes was born in 1596 in La Haye, France. He began his schooling at a Jesuit college before going to Paris to study mathematics and to Poitiers in 1616 to study law. He served in both the Dutch and Bavarian military and settled in Holland in 1629. In 1649, he moved to Stockholm to be a philosophy tutor to Queen Christina of Sweden. He died there in 1650. Because of his general fame and philosophic study of the existence of God, some devout Catholics, thinking he would be canonized a saint, collected relics from his body as it was being transported to France for burial.
