What the bourgeoisie therefore produces, above all, are its own grave-diggers. Its fall and the victory of the proletariat are equally inevitable.

Democracy is the road to socialism.

Communism is the riddle of history solved, and it knows itself to be this solution.

Natural science will in time incorporate into itself the science of man, just as the science of man will incorporate into itself natural science: there will be one science.

Capital is reckless of the health or length of life of the laborer, unless under compulsion from society.

Even an entire society, a nation, or all simultaneously existing societies taken together, are not owners of the earth. They are simply its possessors, its beneficiaries, and have to bequeath it in an improved state to succeeding generations.

Every emancipation is a restoration of the human world and of human relationships to a man himself.