Salvation & the Sacraments
Confessing Sins to a Priest
Christ gave the apostles authority to forgive and to retain sins in his name. In Confession the priest doesn't forgive by his own power — God forgives THROUGH the minister Christ authorized, which is why Jesus breathed the Holy Spirit on them for exactly this.
Jesus explicitly gave the power to forgive sins
On Easter evening the risen Christ breathes the Holy Spirit on the apostles and grants them authority to forgive or retain sins — the same Spirit-breathing as creation. This is a real, transferred authority, exercised in his name.
‘Retain’ requires hearing the sins
To decide whether to forgive OR retain, the minister must know what is confessed — which requires the penitent to tell them. James tells us to ‘confess your sins to one another’ and to call the presbyters (priests).
The ministry of reconciliation
God ‘gave us the ministry of reconciliation’ and makes his appeal through Christ's ambassadors. Forgiveness is God's, delivered through the ministers he sent — just as he heals and teaches through human instruments.
Common objections
“Only God can forgive sins — why go to a man?”
Only God can — and God chose to do it through men he authorized. The crowds ‘glorified God, who had given such authority to MEN’ (Mt 9:8). It's still God forgiving; the priest acts in the person of Christ, by the power Jesus handed on in John 20.
“I can just confess straight to God.”
You can and should turn to God always — but he gave a sacrament with the certainty of hearing the words ‘your sins are forgiven,’ spoken with his own authority. Why would Christ grant the power to forgive AND retain if we were only ever meant to bypass it?
Scripture quoted verbatim from the World English Bible (public domain).