karl marx: On the Jewish Question

If we find that even in the country of complete political emancipation, religion not only exists, but displays a fresh and vigorous vitality, that is proof that the existence of religion is not in contradiction to the perfection of the state. Since, however, the existence of religion is the existence of defect, the source of this defect can only be sought in the nature of the state itself. We no longer regard religion as the cause, but only as the manifestation of secular narrowness. Therefore, we explain the religious limitations of the free citizen by their secular limitations. We do not assert that they must overcome their religious narrowness in order to get rid of their secular restrictions, we assert that they will overcome their religious narrowness once they get rid of their secular restrictions. We do not turn secular questions into theological ones. History has long enough been merged in superstition, we now merge superstition in history. The question of the relation of political emancipation to religion becomes for us the question of the relation of political emancipation to human emancipation. We criticize the religious weakness of the political state by criticizing the political state in its secular form, apart from its weaknesses as regards religion. The contradiction between the state and a particular religion, for instance Judaism, is given by us a human form as the contradiction between the state and particular secular elements; the contradiction between the state and religion in general as the contradiction between the state and its presuppositions in general.
The political emancipation of the Jew, the Christian, and, in general, of religious man, is the emancipation of the state from Judaism, from Christianity, from religion in general. In its own form, in the manner characteristic of its nature, the state as a state emancipates itself from religion by emancipating itself from the state religion – that is to say, by the state as a state not professing any religion, but, on the contrary, asserting itself as a state. The political emancipation from religion is not a religious emancipation that has been carried through to completion and is free from contradiction, because political emancipation is not a form of human emancipation which has been carried through to completion and is free from contradiction.
The limits of political emancipation are evident at once from the fact that the state can free itself from a restriction without man being really free from this restriction, that the state can be a free state [pun on word Freistaat, which also means republic] without man being a free man.