“Behind every great fortune there is a crime.”
What the novel prints, in Ellen Marriage's translation of Father Goriot, is: “The secret of a great success for which you are at a loss to account is a crime that has never been found out, because it was properly executed.” It is spoken by Vautrin, an escaped convict tempting a student — a character's argument, not Balzac's maxim. The famous short form is a rewrite that hardens “a great success for which you are at a loss to account” into “every great fortune”, which says something the text does not.
- — Honoré de Balzac; trans. Ellen Marriage, Father Goriot — translated by Ellen Marriage (Project Gutenberg #1237) (1835)

