Catechism of the Catholic Church §1303 — excerpt
From this fact, Confirmation brings an increase and deepening of baptismal grace: - it roots us more deeply in the divine filiation which makes us cry, "Abba!
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: LG 11 · Council of Florence (1439) DS 1319 · 12 · SL Ambrose, De myst. 7, 42 PL 16, 402-403