The era was a cornucopia of ideas, some of them contradictory, but four themes tie them together: reason, science, humanism and progress.įoremost is reason. Provoked by challenges to conventional wisdom from science and exploration, mindful of the bloodshed of recent wars of religion, and abetted by the easy movement of ideas and people, the thinkers of the Enlightenment sought a new understanding of the human condition.

The Enlightenment is conventionally placed in the last two thirds of the 18th century, though it flowed out of the Scientific Revolution and the Age of Reason in the 17th century and spilled into the heyday of classical liberalism of the first half of the 19th. What is the Enlightenment? There is no official answer, because the era named by Kant’s essay was never demarcated by opening and closing ceremonies like the Olympics, nor are its tenets stipulated in an oath or creed. Enlightenment’s motto, he proclaimed, is: “Dare to understand!” and its foundational demand is freedom of thought and speech. What is enlightenment? In a 1784 essay with that question as its title, Immanuel Kant answered that it consists of “humankind’s emergence from its self-incurred immaturity”, its “lazy and cowardly” submission to the “dogmas and formulas” of religious or political authority.

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