Catechism of the Catholic Church §1466 — excerpt
The confessor is not the master of God's forgiveness, but its servant. the minister of this sacrament should unite himself to the intention and charity of 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: PO 13