Catechism of the Catholic Church §1603 — excerpt
"The intimate community of life and love which constitutes the married state has been established by the Creator and endowed by him with its own proper laws....
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.
Also cites: GS 48 # 1 · GS 47 # 2 · GS 47 # 1