Sean Carroll in Preposterous Universe:
The Greek statesman Demosthenes is credited with saying “I am a citizen of the world,” and the idea that we should take a cosmopolitan view of our common humanity is a compelling one. Not everyone agrees, however; in the words of former British Prime Minister Theresa May, “If you are a citizen of the world, you are a citizen of nowhere.” On the other side of the political spectrum, groups who share a feature of identity — race, ethnicity, gender, sexuality, and others — find it useful to band together to make political progress. Kwame Anthony Appiah is a leading philosopher and cultural theorist who has thought carefully about the tricky issues of cosmopolitanism and identity. We talk about how identities form, why they matter, and how to negotiate the difficult balance between being human and being your particular self.