he was lost and has been found.
Jesus invites sinners to the table of the kingdom: "I came not to call the righteous, but sinners." He invites them to that conversion without which one cannot enter the kingdom, but shows them in word and deed his Father's boundless mercy for them and the vast "joy in heaven over one sinner who repents". The supreme proof of his love will be the sacrifice of his own life "for the forgiveness of sins".
-- CCC 545
With bold confidence, we began praying to our Father. In begging him that his name be hallowed, we were in fact asking him that we ourselves might be always made more holy. But though we are clothed with the baptismal garment, we do not cease to sin, to turn away from God. Now, in this new petition, we return to him like the prodigal son and, like the tax collector, recognize that we are sinners before him. Our petition begins with a "confession" of our wretchedness and his mercy. Our hope is firm because, in his Son, "we have redemption, the forgiveness of sins." We find the efficacious and undoubted sign of his forgiveness in the sacraments of his Church.
-- CCC 2839