The class struggle necessarily leads to the dictatorship of the proletariat.

As individuals express their life, so they are. What they are, therefore, coincides with their production, both with what they produce and with how they produce. The nature of individuals thus depends on the material conditions determining their production.

There is no greater stupidity than for people...to marry and so surrender themselves to the small miseries of domestic and private life.

Misery motivates, not utopia.

The task is not just to understand the world but to change it.

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

Medicine heals doubts as well as diseases.