Catechism of the Catholic Church §197 — excerpt
As on the day of our Baptism, when our whole life was entrusted to the "standard of teaching", let us embrace the Creed of our life-giving faith.
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: St. Ambrose, Expl. symb. I: PL 17, 1193