The great philosopher David Hume wrote that “Reason is, and ought only to be, the slave of the passions, and can never pretend to any other office than to serve and obey them” [1]: emotion is the force that propels thought and action. To understand Hume’s thesis, think about what happens when a kid asks you “why?” over and over again. Why you wake up in the morning, why go to work every day, why you need money, why you want to buy tickets to the Westminster Dog Show—your answer is eventually...
