Catechism of the Catholic Church: 1661
ARTICLE 7 THE SACRAMENT OF MATRIMONY

1661 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 live (cf. Council of Trent:DS 1799).