meaningless — the world is not a polity, so citizenship in it is impossible [...].
the only way to close the relationship with a stranger is to make friends. Not to to ‘make citizens’; not to ‘make brothers’. This is crazy European talk — the discredited language of the bloody French and German experiments in various kinds of border-busting solidarity.
"citizen of the world" and "global citizenship" are, strictly speaking, nonsense. Citizenship is defined by legal and loyalty attachments to a particular political entity with a distinctive regime and culture. Neither the world nor the globe is such an entity.
Berlin was the wrong place to vow to "remake the world once again." Modern Berlin rose from rubble that was the result of the last attempt at remaking "the world."