Catechism of the Catholic Church §319 — excerpt
God created the world to show forth and communicate his glory. That his creatures should share in his truth, goodness and beauty - this is the glory for which God created them.
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.