Catechism of the Catholic Church §1881 — excerpt
Each community is defined by its purpose and consequently obeys specific rules; but "the human person . . is and ought to be the principle, the subject and the end of all social institutions."
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 25 # 1