Marriage was instituted by God Himself in the Garden of Eden, and raised by Christ Our Lord to the dignity of a Sacrament in the New Covenant between two baptized persons. It is a 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” (CCC 1601).
The matrimonial union of man and woman is indissoluble: God himself has determined it "what therefore God has joined together, let no man put asunder” (CCC 1614). Christ Himself “gives the strength and grace to live marriage in the new dimension of the Reign of God. It is by following Christ, renouncing themselves, and taking up their crosses that spouses will be able to "receive" the original meaning of marriage and live it with the help of Christ. This grace of Christian marriage is a fruit of Christ's cross, the source of all Christian life” (CCC 1615).