The sacrament of Matrimony signifies the union of Christ and the Church. It gives spouses the grace to love each other with the love with which Christ has loved his Church; the grace of the sacrament thus perfects the human love of the spouses, strengthens their indissoluble unity, and sanctifies them on the way to eternal life.
-Catechism of the Catholic Church 1661
From the marriage of Christians there comes the family in which new citizens of human society are born and, by the grace of the Holy Spirit in Baptism, those are made children of God so that the People of God may be perpetuated throughout the centuries.
-Lumen Gentium 11