"While you are still on earth, it is impossible to understand what God demands of a soul expiating its sins in Purgatory. You are under the impression that many prayers, well said, will place a soul almost at once in possession of eternal happiness. It is nothing of the kind. Who can fathom the judgments of God? Who can understand how pure a soul must be before He admits it to share His eternal happiness? Alas, if people only knew, if they would only consider it while on earth, what different lives they would lead!
"Seriously reflect how many venial sins one who is careless about her eternal salvation commits in one day. How many minutes does she offer up to God? Does she think of Him seriously at all? Well, there are 365 days in one year, and if there are many such years, that person dies charged with a multitude of venial sins which have not been blotted out because she has not even thought of them.
"When such a soul appears before God to be judged there is scarcely a spark of love left in that soul when she comes to render an account of her life to Him who demands it back from her. Such all but sterile lives have to be begun all over again, when they reach the place of expiation. Lives lived without love for God will have to be atoned for here in Purgatory with intense sufferings. Whilst on earth, they did not profit by the mercy of God, but lived merely for the sake of the body. Now to regain their first splendor, they have to make satisfaction to the last farthing. That is what happens to indifferent souls. For souls of greater guilt, it is far worse.
"Try to love God now so much that you will not have to come here in order to learn how to love Him through sufferings which are without merit. The sufferings and trials of life are meritorious, therefore, do not lose one of them--but above all, love. Love wipes out many faults and makes one avoid them so as not to give pain to the One we love. That is why a soul that really loves Jesus is constantly on its guard to avoid everything that would grieve His divine Heart. There are many souls depending on you to deliver them from this place of suffering. Pray with all your heart for them."
~ From An Unpublished Manuscript on Purgatory ~