There is only one effective antidote for mental suffering and that is physical pain.
While the miser is merely a capitalist gone mad, the capitalist is a rational miser.
From each according to his abilities, to each according to his needs.
On a level plain, simple mounds look like hills; and the insipid flatness of our present bourgeoisie is to be measured by the altitude of its great intellects.
The task is not just to understand the world but to change it.
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.