The forgiveness of sins committed after Baptism is conferred by a particular sacrament called the sacrament of conversion, confession, penance, or reconciliation. CCC 1486
The sinner wounds God's honor and love, his own human dignity as a man called to be a son of God, and the spiritual well-being of the Church, of which each Christian ought to be a living stone. CCC 1487
To return to communion with God after having lost it through sin is a process born of the grace of God who is rich in mercy and solicitous for the salvation of men. One must ask for this precious gift for oneself and for others. CCC1489
The formula of absolution used in the Latin Church expresses the essential elements of this sacrament: the Father of mercies is the source of all forgiveness. He effects the reconciliation of sinners through the Passover of his Son and the gift of his Spirit, through the prayer and ministry of the Church:
God, the Father of mercies, Through the death and the resurrection of his Son has reconciled the world to himself and sent the Holy Spirit among us for the forgiveness of sins; through the ministry of the Church may God give you parson and peace, and I absolve you from your sins in the name of the Father, and of the Son, and of the Holy Spirit. (48) CC1449
Matthew 9:3-8 "And behold some of the scribes said within themselves: He blasphemeth. And Jesus seeing their thoughts, said: Why do you think evil in your hearts? Whether is easier, to say, Thy sins are forgiven thee: or to say, Arise, and walk? But that you may know that the Son of man hath power on earth to forgive sins, (then said he to the man sick of palsy,) Arise, take up thy bed, and go into thy house. And he arose, and went into his house. And the multitude seeing it, feared, and glorified God that gave such power to men.
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"How to make a Good Confession."