Catechism of the Catholic Church §2009 — excerpt
Filial adoption, in making us partakers by grace in the divine nature, can bestow true merit on us as a result of God's gratuitous justice.
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: Council of Trent (1547): DS 1546 · Council of Trent (1547): DS 1548 · St. Augustine, Sermo 298, 4-5: PL 38, 1367