The confessor is not the master of God's forgiveness, but its servant. The minister of this sacrament should unite himself to the intention and charity of Christ. He should have a proven knowledge of Christian behavior, experience of human affairs, respect and sensitivity toward the one who has fallen; he must love the truth, be faithful to the Magisterium of the Church, and lead the penitent with patience toward healing and full maturity. He must pray and do penance for his penitent, entrusting him to the Lord's mercy.
Source: Catechism of the Catholic Church (Vatican.va)