Catechism of the Catholic Church §325 — excerpt
The Apostles' Creed professes that God is "creator of heaven and earth". the Nicene Creed makes it explicit that this profession includes "all that is, seen and unseen".
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.