I did like his phrase though in his letter to the Archbishop of Mainz: "the unhappy souls believe that if they have purchased letters of indulgence they are sure of their salvation; again, that so soon as they cast their contributions into the money-box, souls fly out of purgatory."
By the grace of God, He has given man a means to shorten punishment owed Him, since God is the offended Party by man's sin. Thus, punishment due a man that was not satisfied on earth can be satisfied in purgatory. Indulgences, whether they be alms, fasting, or prayer, are all considered worthy of pious praise and move us closer to God. Our Lord never did away with any of these pillars of Judaism.
Regards