Catechism of the Catholic Church §1911 — excerpt
Human interdependence is increasing and gradually spreading throughout the world. the unity of the human family, embracing people who enjoy equal natural dignity, implies a universal common good.
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 84 # 2