Well, perhaps it is nonsense but the fact that I have read as much and have been told as much by priests is not nonsense. For example, from the book, "Confession: A Little Book for the Reluctant" by Msgr. Louis de Segur...

"If, after absolution you remember any sin, it will not be necessary for that reason to return to Confession; above all it is not necessary to deprive yourself from Holy Communion. It will suffice, the first time you come again to confession, to say, 'Father, at my last confession I involuntarily ommitted such and such sin.'"

I have approached several priests about this and they all concur: even though all one's sins were absolved at one's last confession, one must confess at his next confession any grave sins that he happens to recall thereafter.

I don't understand that because to me absolved means absolved. How could you be absolved of a sin, only to be guilty of it, again, by not confessing it at your next confession on the chance that you happen to remember it?

At any rate, like I say, it's as if you're chained to your past for life in that respect, when it seems to me it would be God's desire that once you're freed, you truly are freed. It would make more sense to me if the teaching were, "and if you later recall a grave sin that you involuntarily omitted, forget about it; it was absolved. Never let it plague you again and move on. Look forward to the future, not backwards to the past."

Well, perhaps it is nonsense but the fact that I have read as much and have been told as much by priests is not nonsense. For example, from the book, "Confession: A Little Book for the Reluctant" by Msgr. Louis de Segur...

"If, after absolution you remember any sin, it will not be necessary for that reason to return to Confession; above all it is not necessary to deprive yourself from Holy Communion. It will suffice, the first time you come again to confession, to say, 'Father, at my last confession I involuntarily ommitted such and such sin.'"

I have approached several priests about this and they all concur: even though all one's sins were absolved at one's last confession, one must confess at his next confession any grave sins that he happens to recall thereafter.

I don't understand that because to me absolved means absolved. How could you be absolved of a sin, only to be guilty of it, again, by not confessing it at your next confession on the chance that you happen to remember it?

At any rate, like I say, it's as if you're chained to your past for life in that respect, when it seems to me it would be God's desire that once you're freed, you truly are freed. It would make more sense to me if the teaching were, "and if you later recall a grave sin that you involuntarily omitted, forget about it; it was absolved. Never let it plague you again and move on. Look forward to the future, not backwards to the past."

Allow me to paraphrase St. Isaac the Syrian's words: "The sins of all flesh do not amount to a handful of sand cast into the ocean of God's love!"
Once you have cast your infinitesimal particle of one speck of sinful send into that Ocean, why do you trouble yourself to find it again?!