… is from page 22 of the 1978 reprint of the English-language translation of Ludwig von Mises‘s 1935 essay “The Freedom to Move as an International Problem” (translated by Bettina Bien Greaves [who this month celebrates her 99th birthday!]); this reprint appears in Ludwig von Mises, The Clash of Group Interests and Other Essays (New York: Center for Libertarian Studies); it is the concluding sentence of that essay:
Without the reestablishment of freedom of migration throughout the world, there can be no lasting peace.