"The proletariat must first of all acquire political supremacy, must rise to be the leading class of the nation, must constitute itself the nation."

"The worker becomes poorer the more wealth he produces, the more his production increases in power and range. The worker becomes an ever cheaper commodity the more commodities he creates."

"The mode of production of material life conditions the general process of social, political and intellectual life. It is not the consciousness of men that determines their existence, but their social …"

"The history of all hitherto existing society is the history of class struggles."

"The proletariat, the lowest stratum of our present society, cannot stir, cannot raise itself up, without the whole superincumbent strata of official society being sprung into the air."