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It was left to Hume, once again, to completely circumscribe reason. “Reason is, and ought only to be, the slave of the passions,” Hume famously wrote, taking to its logical extreme the thought of his predecessors. “[Reason] cannot be the source of moral good or evil, which are found to have that influence.”24
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Ben Shapiro (The Right Side of History: How Reason and Moral Purpose Made the West Great)