"Membership in the social democracy means a struggle, a political struggle with grievous persecutions, and a private struggle for existence, a struggle that for the majority is far more difficult and heavy than the political struggle. And it is necessary, because the courage for this twofold struggle is created only by the consciousness that the injustice of society by which the great majority of mankind are to-day oppressed, corrupted and crippled, can only be abolished through a revolutionary movement, that is, a movement that shall completely exterminate capitalism with every fiber of its roots."