A Natural Institution:

Marriage is a practice common to all cultures in all ages. It is, therefore, a natural institution, something common to all mankind.

At its most basic level, marriage is a union between a man and a woman for the purpose of procreation and mutual support, or love. Each spouse in a marriage gives up some rights over his or her life in exchange for rights over the life of the other spouse.

While divorce has existed throughout history, it has been rare until recent centuries, which indicates that, even in its natural form, marriage is meant to be a lifelong, union.

The Elements of a Natural Marriage:As Fr. John Hardon explains in his Pocket Catholic Dictionary, there are four elements common to natural marriage throughout history:

1.  It is a union of opposite sexes.

2.  It is a lifelong union, ending only with the death of one spouse.

3.  It excludes a union with any other person so long as the marriage exists.

4.  Its lifelong nature and exclusiveness are guaranteed by contract.

So, even at a natural level, divorce, adultery, and "homosexual marriage" are not compatible with marriage, and a lack of commitment means that no marriage has taken place.

A Supernatural Institution:In the Catholic Church, however, marriage is more than a natural institution; it was elevated by Christ Himself, in His participation in the wedding at Cana (John 2:1-11), to be one of the seven sacraments.

A marriage between two Christians, therefore, has a supernatural element as well as a natural one. While few Christians outside of the Catholic and Orthodox Churches regard marriage as a sacrament, the Catholic Church insists that marriage between any two baptized Christians, as long as it is entered into with the intention to contract a true marriage, is a sacrament.Can I Get Married in the Catholic Church?

The Ministers of the Sacrament:

How can a marriage between two non-Catholic but baptized Christians be a sacrament, if a Catholic priest does not perform the marriage? Most people, including most Roman Catholics, do not realize that the ministers of the sacrament are the spouses themselves. While the Church strongly encourages Catholics to marry in the presence of a priest (and to have a wedding Mass, if both prospective spouses are Catholic), strictly speaking, a priest is not needed.

The Mark and Effect of the Sacrament:

The spouses are the ministers of the sacrament of marriage because the mark—the external sign—of the sacrament is not the wedding Mass or anything the priest might do but the marriage contract itself. This does not mean the wedding license that the couple receives from the state, but the vows that each spouse makes to the other. As long as each spouse intends to contract a true marriage, the sacrament is performed.

The effect of the sacrament is an increase in sanctifying grace for the spouses, a participation in the divine life of God Himself.

The Union of Christ and His Church:

This sanctifying grace helps each spouse to help the other advance in holiness, and it helps them together to cooperate in God's plan of redemption by raising up children in the Faith.