Political freedom is not – and cannot be – based upon the relativistic idea that all conceptions of the human person’s good have the same value and truth, but rather, on the fact that politics are concerned with very concrete realizations of the true human and social good in given historical, geographic, economic, technological, and cultural contexts. From the specificity of the task at hand and the variety of circumstances, a plurality of morally acceptable policies and solutions arises. It is not the Church’s task to set forth specific political solutions – and even less to propose a single solution as the acceptable one – to temporal questions that God has left to the free and responsible judgment of each person. It is, however, the Church’s right and duty to provide a moral judgment on temporal matters when this is required by faith or the moral law. If Christians must «recognize the legitimacy of differing points of view about the organization of worldly affairs«, they are also called to reject, as injurious to democratic life, a conception of pluralism that reflects moral relativism. Democracy must be based on the true and solid foundation of non-negotiable ethical principles, which are the underpinning of life in society.
On the level of concrete political action, there can generally be a plurality of political parties in which Catholics may exercise – especially through legislative assemblies – their right and duty to contribute to the public life of their country. This arises because of the contingent nature of certain choices regarding the ordering of society, the variety of strategies available for accomplishing or guaranteeing the same fundamental value, the possibility of different interpretations of the basic principles of political theory, and the technical complexity of many political problems. It should not be confused, however, with an ambiguous pluralism in the choice of moral principles or essential values. The legitimate plurality of temporal options is at the origin of the commitment of Catholics to politics and relates directly to Christian moral and social teaching. It is in the light of this teaching that lay Catholics must assess their participation in political life so as to be sure that it is marked by a coherent responsibility for temporal reality. – from The Participation of Catholics in Political Life (2002)