“The rich experience of history teaches that up to now not a single class has voluntarily made way for another class. There is no such precedent in world history. The Communists have learned this lesson of history. Communists would welcome the voluntary departure of the bourgeoisie. But such a turn of affairs is improbable; that is what experience teaches. That is why the Communists want to be prepared for the worst and call upon the working class to be vigilant, to be prepared for battle.” - Stalin