Durant’s letter explores why many people of his time felt like they were living in an existential vacuum. For thousands of years, after all, human beings have believed in the existence of a transcendent and supernatural realm, populated by gods and spirits, that lies beyond the sensory world of everyday experiences. They regularly felt the presence of this spiritual realm, which infused the ordinary world with meaning. But, Durant argued, modern philosophy and science have shown that the belief in such a world—a world that cannot be seen or touched—is naïve at best and superstitious at worst.
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