Capital is money, capital is commodities. By virtue of it being value, it has acquired the occult ability to add value to itself. It brings forth living offspring, or, at the least, lays golden eggs.
— Karl Marx
History repeats itself, first as tragedy, second as farce.
Necessity is blind until it becomes conscious. Freedom is the consciousness of necessity.
Natural science will in time incorporate into itself the science of man, just as the science of man will incorporate into itself natural science: there will be one science.
The ideas of the ruling class are in every epoch the ruling ideas, i.e., the class which is the ruling material force of society, is at the same time its ruling intellectual force.
Let the ruling classes tremble at a communist revolution. The proletarians have nothing to lose but their chains. They have a world to win. Workingmen of all countries, unite!
Men's ideas are the most direct emanations of their material state.
The theory of Communism may be summed up in one sentence: Abolish all private property.
Reason has always existed, but not always in a reasonable form.