Catechism of the Catholic Church §770 — excerpt
The Church is in history, but at the same time she transcends it. It is only "with the eyes of faith" that one can see her in her visible reality and at the same time in her spiritual reality as bearer of divine life.
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: Roman Catechism 1, 10, 20