Thought this might help, it's an excerpt on Purgatory from the Diary of Saint Faustina Kolowska.
Diary No. 20
(Vision of Purgatory)
"One day I asked the Lord, Lord, who else should I pray for? Jesus said that on the following night He would let me know for whom I should always pray for.
The following night, I saw my Guardian Angel who asked me to follow him. In a moment I was in a misty place full of fire in which there was a great crowd of suffering souls. They were praying fervently, but to no avail, for themselves; only we can come to their aid. The flames which were burning them did not touch me at all. My Guardian Angel did not leave me for an instant. I asked these souls what their greatest suffering was. They answered me in one voice that their greatest torment was longing for God. I saw Our Lady visiting the souls in Purgatory. The souls call her The Star of the Sea. She brings them refreshment. I wanted to talk with them some more, but my Guardian Angel beckoned me to leave. We went out of the prison of suffering. [I heard an interior voice] which said, My mercy does not want this, but justice demands it. Since that time, I am in closer communion with the suffering souls."
Justice demands that we cannot enter heaven unless we have fully paid our debts. That is why, while still here on earth, let us begin to pay for our debts. When we go to confession, we are asked to say penance, and thats it. That is not enough. We have to make reparation. It is not enough to pray three Our Fathers and then no more. The goodness of God cannot be satisfied just like that. Thats why the need for us to offer daily our sufferings, offer daily our trials for the poor souls and, especially, for our own souls to shorten our stay in Purgatory.
"Since that time I am always in closer communion with the suffering souls."
Diary No. 58
"One night, a sister who had died two months previously came to me. She was a sister of the first choir. I saw her in a terrible condition, all in flames with her face painfully distorted. This lasted only a short time, and then she disappeared. A shudder went through my soul because I did not know whether she was suffering in purgatory or in hell. Nevertheless, I redoubled my prayers for her. The next night she came again, but I saw her in an even more horrible state, in the midst of flames which were even more intense, and despair was written all over her face. I was astonished to see her in a worse condition after the prayers I had offered for her, and I asked, Havent my prayers helped you? She answered that my prayers had not helped her and that nothing would help her. I said to her, And the prayers which the whole community has offered for you, have they not been any help to you? She said no, that these prayers have helped some other souls. I replied, If my prayers are not helping you, Sister, please stop coming to me. She disappeared at once. Despite this, I kept on praying.
"After some time she came back again to me during the night, but already her appearance had changed. There were no longer any flames, as there had been before, and her face was radiant, her eyes beaming with joy. She told me that I had a true love for my neighbor and that many other souls had profited from my prayers. She urged me not to cease praying for the souls in purgatory, and she added that she herself would not remain there much longer. How astounding are the decrees of God!"
Diary No. 314
"When I went to the garden one afternoon, my Guardian Angel said to me, Pray for the dying. So I began at once to pray the Rosary with the gardeners for the dying. After the Rosary, we said different prayers for the dying. After the prayers, the wards began to talk among themselves. In spite of that noise, I heard these words in my soul, Pray for me. But as I could not understand these words very well, I moved a few steps away trying to think who it could be was asking me to pray. Then I heard the words, I am Sis. (blank). The sister was in Warsaw while I was at the time in Vilnius. The sister said, Pray for me until I tell you to stop. I am dying at this moment. Immediately, I began to pray fervently for her to the Expiring Heart of Jesus. I kept praying from 3 oclock until 5. At five I heard the words, Thank you, sister, and I understood that she had died. During the holy mass on the following day, I continued to pray fervently for her soul. In the afternoon, a postcard came saying that Sister had died at such and such a time. I understood that it was at that same hour when she had said to me, Pray for me."
Diary No. 412
"There was no one in the chapel so I got up, picked up the pieces of the flower pot, repotted the flower, and tried to do all these before anyone came in. But I did not manage to do so, a Mother Superior came in at that moment, together with the sister sacristan and several other sisters. Mother Superior was surprised that I had been touching something at the altar and thus caused the flower to fall. Sister Sacristan showed her displeasure and I did my best not to explain or excuse myself. But, towards evening, I was exhausted and could not make my holy hour, so I asked Mother Superior to allow me to go to bed early. I fell asleep as soon as I laid down, but at about eleven oclock Satan shook my bed. I awoke instantly and I started to pray peacefully to my Guardian Angel. Then I saw the souls who are doing penance in Purgatory. They appeared like shadows and among them I saw many demons. One of these tried to vex me, taking the form of a cat. He kept pawing on to my bed and on my feet and he was quite heavy, as if weighing a ton. I kept praying the Rosary all the while and, toward dawn, these beings vanished. And I was able to get some sleep.
When I entered the chapel in the morning, I heard a voice in my soul, You are united to me, fear nothing. But know, my child, that Satan hates you. He hates every soul, but he burns with a particular hatred for you, because you have snatched so many souls from his dominion."