In his homily October 7 at the opening mass for the Synod of Bishops gathered in Rome to discuss the New Evangelization, Pope Benedict XVI spoke of the connection between marriage and evangelization. (The Gospel and the First Reading of that Sunday both spoke about marriage.)
Pope Benedict XVI: The theme of marriage, found in the Gospel and the first reading, deserves special attention. The message of the word of God may be summed up in the expression found in the Book of Genesis and taken up by Jesus himself: “Therefore a man leaves his father and his mother and cleaves to his wife, and they become one flesh” (Gen 2:24; Mk 10:7-8). What does this word say to us today? It seems to me that it invites us to be more aware of a reality, already well known but not fully appreciated: that matrimony is a Gospel in itself, a Good News for the world of today, especially the dechristianized world. The union of a man and a woman, their becoming “one flesh” in charity, in fruitful and indissoluble love, is a sign that speaks of God with a force and an eloquence which in our days has become greater because unfortunately, for various reasons, marriage, in precisely the oldest regions evangelized, is going through a profound crisis. And it is not by chance. Marriage is linked to faith, but not in a general way. Marriage, as a union of faithful and indissoluble love, is based upon the grace that comes from the triune God, who in Christ loved us with a faithful love, even to the Cross. Today we ought to grasp the full truth of this statement, in contrast to the painful reality of many marriages which, unhappily, end badly. There is a clear link between the crisis in faith and the crisis in marriage. And, as the Church has said and witnessed for a long time now, marriage is called to be not only an object but a subject of the new evangelization. This is already being seen in the many experiences of communities and movements, but its realization is also growing in dioceses and parishes, as shown in the recent World Meeting of Families.
– Homily at the Holy Mass for the Opening of the Synod of Bishops (Oct. 7, 2012), emphasis added