The purpose of marriage is beautifully expressed in the Catholic Catechism:
1603 "The intimate community of life and
love which constitutes the married state has been established by the Creator and endowed by him with its own proper laws… God himself is the author of marriage."87 The vocation to marriage is written in the very nature of man and woman as they came from the hand of the Creator.
Marriage is not a purely human institution despite the many variations it may have undergone through the centuries in different cultures, social structures, and spiritual attitudes…
1604 God who created man out of love also calls him to love the fundamental and innate vocation of every human being. For man is created in the image and likeness of God who is himself love.90 Since God created him man and woman, **their mutual love **becomes an image of the absolute and unfailing love with which God loves man…
1605 Holy Scripture affirms that
man and woman were created for one another: "It is not good that the man should be alone."92 The woman, “flesh of his flesh,” i.e., his counterpart, his equal, his nearest in all things, is given to him by God as a “helpmate”; she thus represents God from whom comes our help.93 “Therefore a man leaves his father and his mother and cleaves to his wife, and they become one flesh.”
1641 "By reason of their state in life and of their order, [Christian spouses] have their own special gifts in the People of God."145 This grace proper to the sacrament of Matrimony is intended to perfect the couple’s **love **and to strengthen their indissoluble unity…
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."147 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,"148 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.149
- Tertullian, Ad uxorem. 2, 8, 6-7