No puedes esperar construir un mundo mejor sin mejorar a las personas.
Pierre Curie (1923), as translated by Charlotte Kellogg and Vernon Lyman Kellogg, p. 168
En otros idiomas
You cannot hope to build a better world without improving the individuals. To that end each of us must work for his own improvement, and at the same time share a general responsibility for all humanity, our particular duty being to aid those to whom we think we can be most useful.