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Catholic Catechism (981-983)
II. The Power Of The Keys

981    After his Resurrection, Christ sent his apostles “so that repentance and forgiveness of sins should be preached in his name to all nations.”524 The apostles and their successors carry out this “ministry of reconciliation,” not only by announcing to men God’s forgiveness merited for us by Christ, and calling them to conversion and faith; but also by communicating to them the forgiveness of sins in Baptism, and reconciling them with God and with the Church through the power of the keys, received from Christ:525

[The Church] has received the keys of the Kingdom of heaven so that, in her, sins may be forgiven through Christ’s blood and the Holy Spirit’s action. In this Church, the soul dead through sin comes back to life in order to live with Christ, whose grace has saved us.526
982    There is no offense, however serious, that the Church cannot forgive. “There is no one, however wicked and guilty, who may not confidently hope for forgiveness, provided his repentance is honest.527 Christ who died for all men desires that in his Church the gates of forgiveness should always be open to anyone who turns away from sin.528

983    Catechesis strives to awaken and nourish in the faithful faith in the incomparable greatness of the risen Christ’s gift to his Church: the mission and the power to forgive sins through the ministry of the apostles and their successors:

The Lord wills that his disciples possess a tremendous power: that his lowly servants accomplish in his name all that he did when he was on earth.529

Priests have received from God a power that he has given neither to angels nor to archangels . . . . God above confirms what priests do here below.530

Were there no forgiveness of sins in the Church, there would be no hope of life to come or eternal liberation. Let us thank God who has given his Church such a gift.531
524. Lk 24:47.
525. 2 Cor 5:18.
526. St. Augustine, Sermo 214, 11: PL 38, 1071-1072.
527. Roman Catechism, I, 11, 5.
528. Cf. Mt 18:21-22.
529. Cf. St. Ambrose, De poenit. I, 15: PL 16, 490.
530. John Chrysostom, De sac. 3, 5: PG 48, 643.
531. St. Augustine, Sermo 213, 8: PL 38, 1064.