Catechism of the Catholic Church §1394 — excerpt
As bodily nourishment restores lost strength, so the Eucharist strengthens our charity, which tends to be weakened in daily life; and this living charity wipes away venial sins.
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 (1551): DS 1638 · St. Fulgentius of Ruspe, Contra Fab. 28, 16-19: CCL 19A, 813-814