For your consideration: Martha Nussbaum's Patriotism and Cosmopolitanism:

Becoming a citizen of the world is often a lonely business. It is, in effect, as Diogenes said, a kind of exile -- from the comfort of local truths, from the warm nestling feeling of patriotism, from the absorbing drama of pride in oneself and one's own. In the writings of Marcus Aurelius (as in those of his American followers Emerson and Thoreau) one sometimes feels a boundless loneliness, as if the removal of the props of habit and local boundaries had left life bereft of a certain sort of warmth and security. If one begins life as a child who loves and trusts its parents, it is tempting to want to reconstruct citizenship along the same lines, finding in an idealized image of a nation a surrogate parent who will do one's thinking for one. Cosmopolitanism offers no such refuge; it offers only reason and the love of humanity, which may seem at times less colorful than other sources of belonging.