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Marriage

"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.

You can read further as marriage as a vocation in the Catechism of the Catholic Church by using the link to the USCCB website or visit the Office of Family and Youth Ministry at the official Diocese of Springfield in IL website.