Religion is the opiate of the people.

Men make their own history but not in circumstances of their own choosing.

In proportion as capital accumulates, the lot of the laborer, be his payment high or low, must grow worse.

Machines were, it may be said, the weapon employed by the capitalists to quell the revolt of specialized labor.

The essence of the free press is the reliable, reasonable and moral nature of freedom.

The philosophers have only interpreted the world, in various ways: the point, however, is to change it.

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.