I believe international work is a heavy task, but that it is nevertheless indispensable to go through an apprenticeship in it, at the cost of many efforts and also of a real spirit of sacrifice: however imperfect it may be, the work of Geneva has a grandeur that deserves our support.
Marie Curie's letter to Eve Curie Labouisse (July 1929), as quoted in Eve Curie Labouisse "Madame Curie: A Biography" translated by Vincent Sheean (p. 341), 1937.