Catechism of the Catholic Church §1469 — excerpt
This sacrament reconciles us with the Church. Sin damages or even breaks fraternal communion. the sacrament of Penance repairs or restores it. In this sense it does not simply heal the one restored to ecclesial communion, but has also a revitalizing effect on the life…
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 48-50 · John Paul II, RP 31, 5