Our Lord and Master Jesus Christ, when He said Poenitentiam agite, willed that the whole life of believers should be repentance.
This word cannot be understood to mean sacramental penance, i.e., confession and satisfaction, which is administered by the priests.
Yet it means not inward repentance only; nay, there is no inward repentance which does not outwardly work divers mortifications of the flesh.
The penalty [of sin], therefore, continues so long as hatred of self continues; for this is the true inward repentance, and continues until our entrance into the kingdom of heaven.
The pope does not intend to remit, and cannot remit any penalties other than those which he has imposed either by his own authority or by that of the Canons.
The pope cannot remit any guilt, except by declaring that it has been remitted by God and by assenting to God’s remission; though, to be sure, he may grant remission in cases reserved to his judgment. If his right to grant remission in such cases were despised, the guilt would remain entirely unforgiven.