The Eucharist is the “source and summit” of the Catholic life and it is the “very source of Christian marriage…to which Christian marriage is intimately connected.”  Sacrifice is central to both. “This is my body which is given up for you.” (Luke 22:19). Christ gave His life up for the salvation of the world. To be wed to His bride, He had to sacrifice His life, and ultimately give His bride His body in the Blessed Eucharist so that we may be one with Him. When His bride receives Him into herself the Bridegroom (Christ) and the Bride (you and me) became one in communion.
Holy Matrimony also requires sacrifice as described by Paul in Ephesians 5. A man and a woman are called to sacrifice not merely “in its common connotation of enduring difficulty or of giving up something,” but rather “in its etymological meaning of making holy.” In marriage the man and the women must sacrifice themselves in order to be one with their spouse. Like Christ in the Eucharist, the couple sacrifices their bodies in sexual intercourse. Here, the bride receives the bridegroom and the two become one. John Kippley says, “It is, then, this sacramental offering of self to each other, this true sacrificial offering, that makes morally good and humanly meaningful their subsequent communion in sexual intercourse.”