Although gold and silver are not by nature money, money is by nature gold and silver.

Without the presence of class warfare, trade unions would be hard put to justfy their existence.

The ideas of the ruling class are in every epoch the ruling ideas, i.e., the class which is the ruling material force of society, is at the same time its ruling intellectual force.

The proletarians have nothing to loose but their chains. They have a world to win.

In this sense, the theory of the Communists may be summed up in the single sentence: Abolition of private property. - Manifesto of the Communist Party

All science would be superfluous if the outward appearance and the essence of things directly coincided.

The French need a thrashing. If the Prussians win, the centralization of state power will be useful for the centralization of the German working class. German predominance would also transfer the center of gravity of the workers' movement in Western Europe from France to Germany, and one has only to compare the movement in the two countries from 1866 until now to see that the German working class is superior to the French both theoretically and organizationally.