If a person has only venial sins to confess, he must have the purpose of avoiding at least one of them. He should want to avoid all of them, but he must have the purpose of avoiding at least one of them or his confession is worthless.
Maybe I’m just obtuse about this, but are you saying that there is a difference between “I’ll try not to commit that sin again, but if it comes down to it, I may choose to sin rather than not sin” (purpose of amendment, but not a firm one) and “I am not even going to try to avoid that sin, I intend to commit it”? (full intention to continue to commit a personal sin). In my mind, there is a difference.
And more often than not, when I go to confession, the priest absolves by saying “I absolve you from
all your sins in the name of the Father, and of the Son, and of the Holy Spirit”. The word “all” is not part of the rubrics of the sacrament (
ego te absolvo a peccatis tuis in nomine Patris, et Filii, + et Spiritus Sancti,
not ego te absolvo ab omnibus peccatis tuis).
Is the priest saying “all” in acknowledgement of my having specified that I am sorry for all of my sins, mortal and venial? And if not, if these are the words that this priest uses for all of his penitents, is he not in the position of absolving sins that are not repented (in the case of those who have withheld venial sins that they intend to go on committing)? In other words, is Almighty God forgiving venial sins even if the penitent is not sorry for them?
As a mortal man in the wayfaring state, I forgive those who have offended me, whether they ask for it or not, and whether they intend to continue offending me or not. I have no demands of justice — I just forgive unconditionally. But I am not God. He does have demands of perfect justice as well as perfect mercy.