The writer must earn money in order to be able to live and to write, but he must by no means live and write for the purpose of making money.
Karl MarxThe English have all the material requisites for the revolution. What they lack is the spirit of generalization and revolutionary ardour.
Karl MarxOnce the inner connection is grasped, all theoretical belief in the permanent necessity of existing conditions collapses before their collapse in practice -- Letter to Ludwig Kugelmann (July 11, 1868)
Karl Marx