History does nothing, possesses no enormous wealth, fights no battles. It is rather man, the real, living man, who does everything, possesses, fights. It is not History, as if she were a person apart, who uses men as a means to work out her purposes, but history itself is nothing but the activity of men pursuing their purposes.

...the realm of freedom does not commence until the point is passed where labor under the compulsion of necessity and of external utility is required.

Private property has made us so stupid and one-sided that an object is only ours when we have it

We should not say that one man's hour is worth another man's hour, but rather that one man during an hour is worth just as much as another man during an hour. Time is everything, man is nothing: he is at the most time's carcass.

There is no royal road to science, and only those who do not dread the fatiguing climb of its steep paths have a chance of gaining its luminous summits. (Preface to the French edition).

...the very cannibalism of the counterrevolution will convince the nations that there is only one way in which the murderous death agonies of the old society and the bloody birth throes of the new society can be shortened, simplified and concentrated, and that way is revolutionary terror.

In proportion as the bourgeoisie, i.e., capital, is developed, in the same proportion is the proletariat, the modern working class, developed - a class of labourers, who live only so long as they find work, and who find work only so long as their labour increases capital. These labourers, who must sell themselves piecemeal, are a commodity, like every other article of commerce, and are consequently exposed to all the vicissitudes of competition, to all the fluctuations of the market.