In the national struggles of the proletarians of the different countries, they point out and bring to the front the common interest of the entire proletariat, independently of all nationality.

Perseus wore a magic cap that the monsters he hunted down might not see him. We draw the magic cap down over eyes and ears as a make-believe that there are no monsters.

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).

All our inventions have endowed material forces with intellectual life, and degraded human life into a material force.

The more a ruling class is able to assimilate the most prominent men of a ruled class, the more solid and dangerous its rule.

Men's ideas are the most direct emanations of their material state.

2 is a proletariat prime, but 4, 6 and 8 are also composite proletariats. Composites of the world unite; you have nothing to lose but your chains!