If works are a result of Grace, then there is no need for supererogation, purgatory, nor indulgences.
For no one can do more good work than God has prepared beforehand.
And no one can atone for sins that have already been atoned for by Christ, whether theirs or another’s.
Your comment; “If works are a result of Grace, then there is no need for supererogation, purgatory, nor indulgences.
For no one can do more good work than God has prepared beforehand.”
This does not make logical sense.
If God gives us actual grace to help us become holy or as a promise for our good deeds. Actual grace is for the moment and then gone. Sanctifying grace can be lost through mortal sin.
Did you read the differences in Catholic and Protestant understanding if sanctifying grace?
If you believe that Christ death on the cross forgave all future sins, then you do not understand the Bible and reject Christ’s teachings.
Do you pray the Our Father and understand the meaning when you ask for forgiveness of your debts (sins) and we are required to forgive the debts of other?
Parables are teaching moments. Such as Parable of the Unmerciful servant (Mat 18:23-35) and Parable of Talents (Mat 25:14-30) These are examples of God’s forgiveness or lack of forgiveness.
Why did Jesus give His disciples and their successors the power to forgive sins, if all sins were forgiven by his death on the cross? (John 20:22-23)?
Christ’s dying on the the cross was the final bloody sacrifice for our sins and God then opened Heaven for those that were judged worthy by Jesus.