One interesting thing to note about the sacrament of matrimony is that, while most sacraments are conferred by the priest, in the West matrimony is understood to be conferred by the spouses themselves.
1623 In the Latin Church, it is ordinarily understood that the spouses, as ministers of Christ's grace, mutually confer upon each other the sacrament of Matrimony by expressing their consent before the Church.More from the catechism on this sacrament:
1601 "The matrimonial covenant, by which a man and a woman establish between themselves a partnership of the whole of life, is by its nature ordered toward the good of the spouses and the procreation and education of offspring; this covenant between baptized persons has been raised by Christ the Lord to the dignity of a sacrament."
1638 "From a valid marriage arises a bond between the spouses which by its very nature is perpetual and exclusive; furthermore, in a Christian marriage the spouses are strengthened and, as it were, consecrated for the duties and the dignity of their state by a special sacrament."
The marriage bond
1639 The consent by which the spouses mutually give and receive one another is sealed by God himself. From their covenant arises "an institution, confirmed by the divine law, . . . even in the eyes of society." The covenant between the spouses is integrated into God's covenant with man: "Authentic married love is caught up into divine love."
1640 Thus the marriage bond has been established by God himself in such a way that a marriage concluded and consummated between baptized persons can never be dissolved. This bond, which results from the free human act of the spouses and their consummation of the marriage, is a reality, henceforth irrevocable, and gives rise to a covenant guaranteed by God's fidelity. The Church does not have the power to contravene this disposition of divine wisdom.
The grace of the sacrament of Matrimony
1641 "By reason of their state in life and of their order, [Christian spouses] have their own special gifts in the People of God." This grace proper to the sacrament of Matrimony is intended to perfect the couple's love and to strengthen their indissoluble unity. By this grace they "help one another to attain holiness in their married life and in welcoming and educating their children."
1642 Christ is the source of this grace. "Just as of old God encountered his people with a covenant of love and fidelity, so our Savior, the spouse of the Church, now encounters Christian spouses through the sacrament of Matrimony." Christ dwells with them, gives them the strength to take up their crosses and so follow him, to rise again after they have fallen, to forgive one another, to bear one another's burdens, to "be subject to one another out of reverence for Christ," and to love one another with supernatural, tender, and fruitful love. In the joys of their love and family life he gives them here on earth a foretaste of the wedding feast of the Lamb:
How can I ever express the happiness of a marriage joined by the Church, strengthened by an offering, sealed by a blessing, announced by angels, and ratified by the Father? . . . How wonderful the bond between two believers, now one in hope, one in desire, one in discipline, one in the same service! They are both children of one Father and servants of the same Master, undivided in spirit and flesh, truly two in one flesh. Where the flesh is one, one also is the spirit.
Some Pharisees approached him, and tested him, saying, "Is it lawful for a man to divorce his wife for any cause whatever?" He said in reply, "Have you not read that from the beginning the Creator 'made them male and female' and said, 'For this reason a man shall leave his father and mother and be joined to his wife, and the two shall become one flesh'? So they are no longer two, but one flesh. Therefore, what God has joined together, no human being must separate." (Matt 19:3-6)
"For this reason a man shall leave (his) father and (his) mother and be joined to his wife, and the two shall become one flesh." This is a great mystery, but I speak in reference to Christ and the church. (Eph 5:31-2)