Anonymous: What is the purpose of the contrition at the beginning of every mass? Don't Catholics have to go to confession, so why do we do this?
In his excellent short book A Biblical Walk Through the Mass: Understanding What We Say and Do in the Liturgy, Dr. Edward Sri explains:
Throughout the Old Testament, when God manifests his divine presence to his people, it is usually quite unexpected. […] However, when the people were given advance notice of God’s coming among them, they took time to prepare carefully for this holy encounter. For example, at Mount Sinai, Israel had three days to get ready to meet the Lord, who would come to them in thunder, lightning, and cloud and speak the words of the covenant—the Ten Commandments—directly to the people. In those days of preparation, they were instructed to consecrate themselves to the Lord and to wash their garments (Ex 19:9-19).
We, too, are called to prepare ourselves for a sacred encounter with the Lord every time we go to Mass. Yet our meeting with God is more profound than anyone in ancient Israel ever imagined. For, in the sacred Liturgy, we draw near not just to a manifestation of God’s presence in the form of a cloud, but to the very body and blood of our Lord Jesus Christ in the Blessed Sacrament. And we will receive our divine Lord sacramentally within us in holy communion.
We truly are not worthy to participate in all this. Indeed, our sinfulness stands in stark contrast to what we are about to do in the Mass. And so, the priest invites us to “prepare ourselves to celebrate the sacred mysteries” by humbly confessing our sins publicly before almighty God and the congregation. Just as the people of Israel needed to wash their garments before approaching the Lord at Sinai, so we need to cleanse our souls from sin before we approach God in the Mass. Indeed, washing is a biblical image for the removal of sin (Ps 51:2, 7).
The prayer known as the Confiteor—the first word of this prayer in Latin, meaning “I confess”—stands in a long biblical tradition of confessing one’s sins.
Sri cites Neh 9:2, Ps 32:5, 38:18, Prv 28:13, Sir 4:26, Lv 5:5, Nm 5:7, Dn 9:20, Neh 1:6, Mt 3:6, Mk 1:5, 1 Jn 1:9, Jas 5:16, and 1 Cor 11:28, 27 as examples of the different ways, publicly and privately, communally and individually, Jews and Christians confessed and were commanded to confess before partaking in acts of worship.
In other words, this kind of public, communal prayer for forgiveness from God and from each other has a long history in the Judeo-Christian tradition. It is not meant to replace and cannot substitute for sacramental confession, which absolves us of our sins in a particular and immediate way, but it is an instance of the many times we should make such prayers to God between confessions. It is an inherent part of the public, liturgical act of worship.
God bless you!