From each according to his abilities, to each according to his needs.Karl Marx: Critique of the Gotha Program
Communism and Socialism
A specter is haunting Europe—the specter of Communism.Karl Marx and Friedrich Engels: The Communist Manifesto
History
Hegel remarks somewhere that all great world-historic facts and personages appear, so to speak, twice. He forgot to add: the first time as tragedy, the second time as farce.Karl Marx
Religion
Religion is the sigh of the oppressed creature, the feelings of a heartless world, just as it is the spirit of unspiritual conditions. It is the opium of the people.Karl Marx
Revolution and Rebellion
Let the ruling classes tremble at a Communist revolution. The proletarians have nothing to lose but their chains. They have a world to win. Workers of the world, unite!Karl Marx and Friedrich Engels: The Communist Manifesto
Value
Nothing can have value without being an object of utility.Karl Marx: Das Kapital