The Enlightenments important 17th-century precursors included the Englishmen Francis Bacon and Thomas Hobbes, the Frenchman Renee Descartes and the key natural philosophers of the Scientific Revolution, including Galileo, Kepler and Leibniz. Its roots are usually traced to 1680s England, where in the span of three years Isaac Newton published his Principia Mathematica (1686) and John Locke his Essay Concerning Human Understanding (1689)two works that provided the scientific, mathematical and philosophical toolkit for the Enlightenments major advances.

In his essay "What Is Enlightenment?" (1784), the German philosopher Immanuel Kant summed up the era's motto in the following terms: "Dare to know! Have courage to use your own reason!"

Locke argued that human nature was mutable and that knowledge was gained through accumulated experience rather than by accessing some sort of outside truth. Newtons calculus and optical theories provided the powerful Enlightenment metaphors for precisely measured change and illumination.

There was no single, unified Enlightenment. Instead, it is possible to speak of the French Enlightenment, the Scottish Enlightenment and the English, German, Swiss or American Enlightenment. Individual Enlightenment thinkers often had very different approaches. Locke differed from Hume, Rousseau from Voltaire, Thomas Jefferson from Frederick the Great. Their differences and disagreements, though, emerged out of the common Enlightenment themes of rational questioning and belief in progress through dialogue.

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Enlightenment - Facts & Summary - HISTORY.com