The Catholic Church and the Political Community
a. Autonomy and independence
424. Although the Church and the political community both manifest themselves in visible organizational structures, they are by nature different because of their configuration and because of the ends they pursue. The Second Vatican Council solemnly reaffirmed that, in their proper spheres, the political community and the Church are mutually independent and self-governing. The Church is organized in ways that are suitable to meet the spiritual needs of the faithful, while the different political communities give rise to relationships and institutions that are at the service of everything that is part of the temporal common good. The autonomy and independence of these two realities is particularly evident with regards to their ends.
The duty to respect religious freedom requires that the political community guarantee the Church the space needed to carry out her mission. For her part, the Church has no particular area of competence concerning the structures of the political community: The Church respects the legitimate autonomy of the democratic order and is not entitled to express preferences for this or that institutional or constitutional solution, nor does it belong to her to enter into questions of the merit of political programmes, except as concerns their religious or moral implications.
b. Cooperation
425. The mutual autonomy of the Church and the political community does not entail a separation that excludes cooperation. Both of them, although by different titles, serve the personal and social vocation of the same human beings. The Church and the political community, in fact, express themselves in organized structures that are not ends in themselves but are intended for the service of man, to help him to exercise his rights fully, those inherent in his reality as a citizen and a Christian, and to fulfil correctly his corresponding duties. The Church and the political community can more effectively render this service for the good of all if each works better for wholesome mutual cooperation in a way suitable to the circumstances of time and place. …