Catechism of the Catholic Church §684 — excerpt
Through his grace, the Holy Spirit is the first to awaken faith in us and to communicate to us the new life, which is to "know the Father and the one whom he has sent, Jesus Christ."
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: In 17:3 · St. Gregory of Nazianzus, Oratio theol., 5, 26 (= Oratio 31, 26): PG 36, 161-163