"It is possible to argue that the really influential book is not that which converts ten millions of casual readers, but rather that which converts the very few who, at any given moment, succeed in seizing power. Marx and Sorel have been influential in the modern world, not so much because they were best-sellers (Sorel in particular was not at all a widely read author), but because among their few readers were two men, called respectively Lenin and Mussolini."