Catechism of the Catholic Church §2681 — excerpt
"No one can say 'Jesus is Lord', except by the Holy Spirit" (1 Cor 12:3). the Church invites us to invoke the Holy Spirit as the interior Teacher of Christian prayer.
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.