Catechism of the Catholic Church §2570 — excerpt
When God calls him, Abraham goes forth "as the Lord had told him"; Abraham's heart is entirely submissive to the Word and so he obeys.
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.