Now, what are those means which we have to employ in order to avoid, or at least shorten our Pugatory and mitigate its rigor? They are evidently those exercised and good works which most assist us to satisfy for our faults in this world and to find mercy before God, namely, the following: devotion to the Blessed Virgin Mary, and fidelity in wearing her scapular; charity towards the living and the dead; mortification and obedience; a pious reception of the Sacraments, especially on the approach of death; confidence in the Divine Mercy; and, finally, the holy acceptance of death in union with the death of Jesus upon the cross.
“He who purifies himself from his faults in the present life,” says St. Catherine of Genoa, “satisfies with a penny a debt of a thousand ducats; and he who waits until the other life to discharge his debts, consents to pay a thousand ducats for that which he might before have paid with a penny.”
—from Purgatory: Explained by the Lives and Legends of the Saints by Fr. F.X. Schouppe, S.J., Part Second: Purgatory, The Mystery of God’s Mercy – Ch. 57