From Pope St. John Paul II’s Apostolic Exhortation Familiaris Consortio (1981):
The Christian family is called upon to take part actively and responsibly in the mission of the Church in a way that is original and specific, by placing itself, in what it is and what it does as an “intimate community of life and love,” at the service of the Church and of society.
Since the Christian family is a community in which the relationships are renewed by Christ through faith and the sacraments, the family’s sharing in the Church’s mission should follow a community pattern: the spouses together as a couple, the parents and children as a family, must live their service to the Church and to the world. They must be “of one heart and soul”117 in faith, through the shared apostolic zeal that animates them, and through their shared commitment to works of service to the ecclesial and civil communities.
The Christian family also builds up the Kingdom of God in history through the everyday realities that concern and distinguish its state of life. It is thus in the love between husband and wife and between the members of the family—a love lived out in all its extraordinary richness of values and demands: totality, oneness, fidelity and fruitfulness118—that the Christian family’s participation in the prophetic, priestly and kingly mission of Jesus Christ and of His Church finds expression and realization. Therefore, love and life constitute the nucleus of the saving mission of the Christian family in the Church and for the Church.
The Second Vatican Council recalls this fact when it writes: “Families will share their spiritual riches generously with other families too. Thus the Christian family, which springs from marriage as a reflection of the loving covenant uniting Christ with the Church, and as a participation in that covenant will manifest to all people the Savior’s living presence in the world, and the genuine nature of the Church. This the family will do by the mutual love of the spouses, by their generous fruitfulness, their solidarity and faithfulness, and by the loving way in which all the members of the family work together.”119
Having laid the foundation of the participation of the Christian family in the Church’s mission, it is now time to illustrate its substance in reference to Jesus Christ as Prophet, Priest and King—three aspects of a single reality—by presenting the Christian family as 1) a believing and evangelizing community, 2) a community in dialogue with God, and 3) a community at the service of man.
117 Acts 4:32.
118 Cf. Paul VI, Humanæ Vitæ, 9.
119 Pastoral Constitution on the Church in the Modern World Gaudium et spes, 48.
— Familiaris Consortio 50