… is from page 327 of economist Lionel Robbins’s wise and still-relevant 1937 book, Economic Planning and International Order; it is the book’s final paragraph:
Nationalism is something which must be surpassed. There was probably never a moment in the history of the world when such a task seemed so difficult to accomplish. But it can be accomplished if our hearts and minds tell us that it is necessary; and it must be accomplished if all that we regard as most valuable is not to perish in the wreck of our common civilization.