From Pope St. John Paul II’s Apostolic Exhortation Familiaris Consortio (1981):
In view of the worldwide dimension of various social questions nowadays, the family has seen its role with regard to the development of society extended in a completely new way: it now also involves cooperating for a new international order, since it is only in worldwide solidarity that the enormous and dramatic issues of world justice, the freedom of peoples and the peace of humanity can be dealt with and solved.
The spiritual communion between Christian families, rooted in a common faith and hope and given life by love, constitutes an inner energy that generates, spreads and develops justice, reconciliation, fraternity and peace among human beings. Insofar as it is a “small-scale Church,” the Christian family is called upon, like the “large-scale Church,” to be a sign of unity for the world and in this way to exercise its prophetic role by bearing witness to the Kingdom and peace of Christ, towards which the whole world is journeying.
Christian families can do this through their educational activity—that is to say by presenting to their children a model of life based on the values of truth, freedom, justice and love—both through active and responsible involvement in the authentically human growth of society and its institutions, and by supporting in various ways the associations specifically devoted to international issues.
— Familiaris Consortio 48