“Opposing reason is, by definition, unreasonable.” Steven Pinker is fond of definitions. Early on in this monumental apologia for a currently fashionable version of Enlightenment thinking, he writes: “To take something on faith means to believe it without good reason, so by definition a faith in the existence of supernatural entities clashes with reason.” Well, it’s good to have that settled once and for all. There is no need to trouble yourself with the arguments of historians, anthropologists and evolutionary biologists, who treat religion as a highly complex phenomenon, serving a variety of human needs. All you need do is consult a dictionary, and you will find that religion is – by definition – irrational.
Similarly, you don’t need to bother about what the Enlightenment was actually like. By any standards, David Hume was one of the greatest Enlightenment thinkers. It was the sceptical Scottish philosopher who stirred Immanuel Kant – whose well-known essay on Enlightenment Pinker quotes reverently at the start of the book – from what Kant described as his “dogmatic slumber”. Pinker barely mentions Hume, and the omission is not accidental. He tell us that the Enlightenment is defined by a “non-negotiable” commitment to reason.
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