It is a key concept to many Christians, especially Roman Catholics, who can then seek divine forgiveness through the sacrament of confession, nowadays rather called Penance or the Sacrament of Reconciliation. It is often regarded as a prerequisite to divine forgiveness. More clearly does this appear in the parable of the Pharisee and the publican (Luke, xviii, 13), and more clearly still in the story of the prodigal (Luke, xv, 11-32): "Father, I have sinned against heaven and before thee: I am not worthy to be called thy son".