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

Darwin has interested us in the history of nature's technology.

The burgeoisie, by the rapid improvement of all instruments of production, by the immensely facilitated means of communication, draws all nations into civilization.

The rule of the bourgeois democrats [in pre-federal Germany], from the very first, will carry within it the seeds of its own destruction

All I know is that I am not a Marxist.

The whole proletariat must be armed at once with muskets, rifles, cannon and ammunition, and the revival of the old-style citizens militia, directed against the workers, must be opposed.

All social life is essentially practical. All mysterious which lead theory to mysticism find their rational solution in human practice and in the comprehension of the practice.