The Age of Enlightenment (also the Age of Reason and the Enlightenment) was an intellectual and philosophical movement that occurred in Europe in the 17th and the 18th centuries.[1][2] The Enlightenment featured a range of social ideas centered on the value of knowledge learned by way of rationalism and of empiricism and political ideals such as natural law, liberty, and progress, toleration and fraternity, constitutional government, and the formal separation of church and state.[3][4][5] The Enlightenment was preceded by and overlaps the Scientific Revolution and the work of Johannes Kepler, Galileo Galilei, Francis Bacon, Pierre Gassendi, and Isaac Newton, among others, as well as the rationalist philosophy of Descartes, Hobbes, Spinoza, Leibniz, and John Locke. Some date the beginning of the Enlightenment to the publication of René Descartes' Discourse on the Method in 1637, with his method of systematically disbelieving everything unless there was a well-founded reason for accepting it, and featuring his famous dictum, Cogito, ergo sum ("I think, therefore I am"). Others cite the publication of Isaac Newton's Principia Mathematica (1687) as the culmination of the Scientific Revolution and the beginning of the Enlightenment.[6][7][8] European historians traditionally dated its beginning with the death of Louis XIV of France in 1715 and its end with the outbreak of the French Revolution in 1789. Many historians now date the end of the Enlightenment as the start of the 19th century, with the latest proposed year being the death of Immanuel Kant in 1804.[9] In reality, historical periods do not have clearly defined start or end dates. Philosophers and scientists of the period widely circulated their ideas through meetings at scientific academies, Masonic lodges, literary salons, coffeehouses and in printed books, journals, and pamphlets. The ideas of the Enlightenment undermined the authority of the monarchy and religious officials and paved the way for the political revolutions of the 18th and 19th centuries. A variety of 19th-century movements, including liberalism, socialism,[10] and neoclassicism, trace their intellectual heritage to the Enlightenment.
1. Philosophy
Bacon's empiricism and Descartes' rationalist philosophy laid the foundation for enlightenment thinking.[19] Descartes' attempt to construct the sciences on a secure metaphysical foundation was not as successful as his method of doubt applied in philosophic areas leading to a dualistic doctrine of mind and matter. His skepticism was refined by Locke's Essay Concerning Human Understanding (1690) and Hume's writings in the 1740s. His dualism was challenged by Spinoza's uncompromising assertion of the unity of matter in his Tractatus (1670) and Ethics (1677).[20] According to Jonathan Israel, these laid down two distinct lines of Enlightenment thought: first, the moderate variety, following Descartes, Locke, and Christian Wolff, which sought accommodation between reform and the traditional systems of power and faith, and, second, the Radical Enlightenment, inspired by the philosophy of Spinoza, advocating democracy, individual liberty, freedom of expression, and eradication of religious authority.[21][22] The moderate variety tended to be deistic whereas the radical tendency separated the basis of morality entirely from theology. Both lines of thought were eventually opposed by a conservative Counter-Enlightenment which sought a return to faith.[23] In the mid-18th century, Paris became the center of philosophic and scientific activity challenging traditional doctrines and dogmas. After the Edict of Fontainebleau in 1685, the relationship between church and the absolutist government was very strong. The early enlightenment emerged in protest to these circumstances, gaining ground under the support of Madame de Pompadour, the mistress of Louis XV.[24] Called the Siècle des Lumières, the philosophical movement of the Enlightenment had already started by the early 18th century, when Pierre Bayle launched the popular and scholarly Enlightenment critique of religion. As a skeptic Bayle only partially accepted the philosophy and principles of rationality. He did draw a strict boundary between morality and religion. The rigor of his Dictionnaire Historique et Critique influenced many of the Enlightenment Encyclopédistes. [25] By the mid-18th century the French Enlightenment had found a focus in the project of the Encyclopédie. [24] The philosophical movement was led by Voltaire and Rousseau, who argued for a society based upon reason rather than faith and Catholic doctrine, for a new civil order based on natural law, and for science based on experiments and observation. The political philosopher Montesquieu introduced the idea of a separation of powers in a government, a concept which was enthusiastically adopted by the authors of the United States Constitution. While the philosophes of the French Enlightenment were not revolutionaries and many were members of the nobility, their ideas played an important part in undermining the legitimacy of the Old Regime and shaping the French Revolution.
2. Science
Science played an important role in Enlightenment discourse and thought. Many Enlightenment writers and thinkers had backgrounds in the sciences and associated scientific advancement with the overthrow of religion and traditional authority in favour of the development of free speech and thought.[33] There were immediate practical results. The experiments of Antoine Lavoisier were used to create the first modern chemical plants in Paris, and the experiments of the Montgolfier brothers enabled them to launch the first manned flight in a hot air balloon in 1783.[34] Broadly speaking, Enlightenment science greatly valued empiricism and rational thought and was embedded with the Enlightenment ideal of advancement and progress. The study of science, under the heading of natural philosophy, was divided into physics and a conglomerate grouping of chemistry and natural history, which included anatomy, biology, geology, mineralogy, and zoology.[35] As with most Enlightenment views, the benefits of science were not seen universally: Rousseau criticized the sciences for distancing man from nature and not operating to make people happier.
3. Religion
Enlightenment era religious commentary was a response to the preceding century of religious conflict in Europe, especially the Thirty Years' War.[74] Theologians of the Enlightenment wanted to reform their faith to its generally non-confrontational roots and to limit the capacity for religious controversy to spill over into politics and warfare while still maintaining a true faith in God. For moderate Christians, this meant a return to simple Scripture. Locke abandoned the corpus of theological commentary in favor of an "unprejudiced examination" of the Word of God alone. He determined the essence of Christianity to be a belief in Christ the redeemer and recommended avoiding more detailed debate.[75] Anthony Collins, one of the English freethinkers, published his "Essay concerning the Use of Reason in Propositions the Evidence whereof depends on Human Testimony" (1707), in which he rejects the distinction between "above reason" and "contrary to reason," and demands that revelation should conform to man's natural ideas of God. In the Jefferson Bible, Thomas Jefferson went further and dropped any passages dealing with miracles, visitations of angels, and the resurrection of Jesus after his death, as he tried to extract the practical Christian moral code of the New Testament.
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