Catechism of the Catholic Church §584 — excerpt
Jesus went up to the Temple as the privileged place of encounter with God. For him, the Temple was the dwelling of his Father, a house of prayer, and he was angered that its outer court had become a place of commerce.
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.