Catechism of the Catholic Church §2667 — excerpt
This simple invocation of faith developed in the tradition of prayer under many forms in East and West. the most usual formulation, transmitted by the spiritual writers of the Sinai, Syria, and Mt.
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.