Derek Parfit, who died at age 74 on Sunday evening, was not the most famous philosopher in the world. But he was among the most brilliant, and his papers and books have had a profound, incalculably vast impact on the study of moral philosophy over the past half century. His work did not dwell on topics of merely academic interest. He wrote about big topics that trouble everyone, philosopher and layperson alike: Who am I? What makes me “me”? What separates me from other people? How should I weigh my desires against those of others? What do I owe to my children, and to the future in general? What does it mean for an action to be right or wrong, and how could we know? Parfit was not a prolific...
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