Why do Catholics confess to a priest instead of directly to God?

Catholics believe that confessing to a priest is confessing to God — the priest acts 'in persona Christi' (in the person of Christ). This practice is rooted in Scripture: Jesus gave the apostles the authority to forgive sins when He said, 'Whose sins you forgive are forgiven them' (John 20:23). James 5:16 instructs: 'Confess your sins to one another.' The priest, through ordination and apostolic succession, continues this ministry. Confession to a priest provides: (1) Certainty of forgiveness through the words of absolution. (2) Accountability and guidance from a spiritual counselor. (3) The grace of the sacrament, which strengthens against future sin. (4) Humility through the act of speaking sins aloud. The seal of Confession is absolute and inviolable.