The correct answer is “They believed the emphasis on the scientific method would bring Europe out of darkness”
The Enlightenment was a period of the rule of the scientific method, it was a moment when the Church lost influence over the academia and the importance of philosophers such as Voltaire, John Locke, Thomas Hobbes, David Hume, Rousseau, Adam Smith, and others.
During this period science was ruling, this way there was a creation of scientific methods, the secularization of learning, religious tolerance - in contrast of the power the Church had before - and separation between Church and State.
There was a thought that rational thought would improve humanity because it did not involve personal interests and beliefs.
The supply of books were increasing greatly in Europe from the 15th century to the 18th century.
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One of the main reasons why the Persian Gulf War is cited by some as an event that fueled Islamic extremism is because it involved a lot of military intervention from the West (specifically the US) that led to many Arab deaths.