It’s easy to obsess about the “forgotten sin.” It is Satan who reminds us of our past, not God. Once you have left the confessional, you are clean.
I am reminded of a story a priest told about a prostitute who came to confession. I don’t remember if the story was about Padre Pio or some other famous Saint. It may just have been a story of a simple priest. She was understandably nervous as she entered the confessional. As she completed her confession, the priest hugged her, reminding her of her Baptismal purity at that very moment.
God is not a God of guilt.
Were you to ask God about your worst sin expect to hear, “What sin? It’s not that I don’t remember. It’s that I choose to forget.”
Satan wants to burden you with the guilt that Christ lifted with the Sacrifice of the Cross. Few of us actually commit mortal sin. Few devout Catholics willfully turn away from ,or attempt to sever our relationship with God. That does not mean that we do not commit serious sin needing confession. Any breach in our relationship needs healing. Venial sins are forgiven, healed during the Eucharist. Sacramental Confession, in which we confess even venial sins, is a good and devout practice that keeps us from falling into more serious sin, including mortal sin.
Another way of thinking about it is, do you take another bath after you have already showered or bathed? The priest has given words of absolution, “Your sins are forgiven.” Take them as they are given from the mouth of Christ. Like the woman caught in adultery, there is no one to condemn you. We are to “go and sin no more.”
The reality is that, even the “righteous man sins seven times a day.” I will return to the confessional. If I have not sinned seriously, I will have at least sinned venially between now and my next confession. There are always in my life where I fall short, where I need spiritual direction.
While you might not bring up the specific sin, for which you have already been forgiven, you may if it continues to bother your conscience. The purpose of the Sacrament of Reconciliation is healing. I see a doctor for an overlooked injury or pain, the next time I am in his office. I continue to see him for a chronic illness. That too is a way of looking at that overlooked sin, the spiritual injury. It is the same way that I may bring the same sins, the same temptations that I struggle with on a day to day basis. The priest gives me new insight.
Since the priest is a man, he too needs our prayers. It is also good to pray for the priest before confession, for the Holy Spirit to enlighten him before confession. It truly does make a difference.