"Nationalism is our form of incest, is our idolatry, is our insanity.
'Patriotism' is its cult. It should hardly be necessary to say that by 'patriotism', I mean that attitude which puts the own nation above humanity, above the principles of truth and justice; not the loving interest in one's own nation, which is the concern with the nation's spiritual as much as with its material welfare - never with its power over other nations.
Just as love for one individual which excludes the love for others is not love, love for one's country which is not part of one's love for humanity is not love, but idolatrous worship."
-Erich Fromm (1900-1980), U.S. psychologist