In connection with the prophetic function, that state of life which is sanctified by a special sacrament obviously of great importance, namely, married and family life. For where Christianity pervades the entire mode of family life, ala gradually transforms it, one will find there both the practice and an excellent school of the lay apostolate. In such a home husbands and wives find their proper vocation in being witnesses of the faith and love of Christ to one another and to their children. The Christian family loudly proclaims both the present virtues of the Kingdom of God and the hope of a blessed life to come. Thus by its example and its witness it accuses the world of sin and enlightens those who seek the truth.

–Lumen Gentium, 35