“So they are no longer two, but one flesh. Therefore, what God has joined together,
let no one separate.”
~ Matthew 19:6

“The matrimonial 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; this covenant between baptized persons has been raised by Christ the Lord to the dignity of a sacrament.”

(Catechism of the Catholic Church, 1601)