A spectre is haunting Europe-the spectre of Communism. All the Powers of old Europe have entered into holy alliance to exorcise this spectre: Pope and Czar, Metternich and Guizot, French Radicals and German police-spies. Where is the Party in opposition that has not been decried as Communistic by its opponents in power? Where the Opposition that has not hurled back the branding reproach of Communism, against the more advanced opposition parties, as well as against its reactionary adversaries?

Religion is the opiate of the people.

The task is not just to understand the world but to change it.

Crack-brained meddling by the authorities [can] aggravate an existing crisis.

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. The class which has the means of material production at its disposal, has control at the same time over the means of mental production, so that thereby, generally speaking, the ideas of those who lack the means of mental production are subject to it. The ruling ideas are nothing more than the ideal expression of the dominant material relationships, the dominant material relationships grasped as ideas.

In the eyes of dialectical philosophy, nothing is established for all times, nothing is absolute or sacred.

In the national struggles of the proletarians of the different countries, they point out and bring to the front the common interest of the entire proletariat, independently of all nationality.