11. The parts that penitents themselves have in the celebration of the sacrament are of the greatest importance.
The act of confessing becomes sacramental matter:
When with proper dispositions they approach this saving remedy instituted by Christ and confess their sins, their own acts become part of the sacrament itself, which is completed when the words of absolution are spoken by the minister in the name of Christ.
The penitent and confessor together are con-celebrants in renewal:
In this way the faithful, even as they experience and proclaim the mercy of God in their own life, are with the priest celebrating the liturgy of the Church’s continual self-renewal.