"He said in reply, “Have you not read that from the beginning the Creator ‘made them male and female’  and said, ‘For this reason a man shall leave his father and mother and be joined to his wife, and the two shall become one flesh’?  So they are no longer two, but one flesh. Therefore, what God has joined together, no human being must separate.” 

-Matthew 19:4-6

"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."

-CCC 1601

"Marriage, as a vocation, calls you to steer a tiny boat – wave-tossed yet sturdy, thanks to the reality of the sacrament – across a sometimes stormy sea. How often do you want to say, or better, cry out, like the apostles: “Teacher, do you not care that we are perishing?” (Mk 4:38). Let us never forget, though, that by virtue of the sacrament of matrimony, Jesus is present in that boat; he is concerned for you and he remains at your side amid the tempest."

-Pope Francis
Pope Francis  “AMORIS LAETITIA FAMILY" 2021-2022, https://www.vatican.va/content/francesco/en/letters/2021/documents/20211226-lettera-sposi-anno-famiglia-amorislaetitia.html