All Catholics, priest and bishops included, need to examine themselves before receiving Holy Communion and, if aware of unconfessed grave sin, should refrain from receiving the sacrament before receiving sacramental absolution. (faith.org.uk)
I believe that we have sin that can not go unconfessed for long that God always comes for is when we stray and that ultimately we never stop wanting Him to from the day we are supernaturally recreated by the Spirit of the living God. (redeeminggod.com)
Nobody believes that isolation and humiliation reform criminals, just as nobody really believes that a cleansing fire burns away unconfessed sins in purgatory, yet without any plausible alternatives to humiliation or fire, the healing effect of punishment remains as mysterious for the Church as it does for the judicial system. (firstthings.com)