As far as we can tell, humans alone are endowed with a conceptual category inhabited by words like duty, evil, justice, rights, law, mercy, and virtue. In fact, we seem incapable of thinking about our world apart from the vocabulary of fairness, goodness, crime, love, guilt, and blame—terms loaded with moral meaning. Moreover, ethical terms and the concepts behind them perform a unique task. They do not simply describe a state of affairs;
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