"Socialism has never and nowhere been at first a working-class movement. It is by no means an obvious remedy for an obvious evil which the interests of that class will necessarily demand. It is a construction of theorists, deriving from certain tendencies of abstract thought with which for a long time only the intellectuals were familiar; and it required long efforts by the intellectuals before the working classes could be persuaded to adopt it as their programme."
January 1, 1970
https://en.wikiquote.org/wiki/Studies_in_Philosophy%2C_Politics_and_Economics