In order for the wheel to turn, for life to be lived, impurities are needed, and the impurities of impurities in the soil, too, as is known, if it is to be fertile. Dissension, diversity, the grain of salt and mustard are needed: Fascism does not want them, forbids them, and that's why you're not a Fascist; it wants everybody to be the same, and you are not. But immaculate virtue does not exist either, or if it exists it is detestable.
Primo Levi (July 31, 1919 - April 11, 1987) was an Italian chemist and author of memoirs, short stories, poems, and novels. He is best known for his work on the Holocaust, and in particular his account of the year he spent as a prisoner in Auschwitz.