Marriage in the Church
“The matrimonial covenant, by which a man and a woman establish between themselves a partnership of the whole of life and which is ordered by its nature to the good of the spouses and the procreation and education of offspring, has been raised by Christ the Lord to the dignity of a sacrament between the baptized” (Code of Canon Law, canon 1055 §1).
In order for a Catholic to be validly married, he or she must be married in the Church; that is, in the presence of a bishop, priest, or deacon—unless a dispensation has been obtained (canon 1108 §1). Being married in the Church does not require that a Catholic’s spouse be or become a Catholic.
The Catechism of the Catholic Church explains that, “Since marriage establishes the couple in a public state of life in the Church, it is fitting that its celebration be public, in the framework of a liturgical celebration, before the priest (or a witness authorized by the Church), the witnesses, and the assembly of the faithful” (no. 1663).