Purgatory

The Catholic Church has always taught that all who die in God's grace and friendship, but still imperfectly purified, are indeed assured of their eternal salvation; but after death they undergo purification, so as to achieve the holiness necessary to enter the joy of heaven.

Catechism Of The Catholic Church

1030 All who die in God's grace and friendship, but still imperfectly purified, are indeed assured of their eternal salvation; but after death they undergo purification, so as to achieve the holiness necessary to enter the joy of heaven.

1031 The Church gives the name Purgatory to this final purification of the elect, which is entirely different from the punishment of the damned. The Church formulated her doctrine of faith on Purgatory especially at the Councils of Florence and Trent. The tradition of the Church, by reference to certain texts of Scripture, speaks of a cleansing fire:
As for certain lesser faults, we must believe that, before the Final Judgment, there is a purifying fire. He who is truth says that whoever utters blasphemy against the Holy Spirit will be pardoned neither in this age nor in the age to come. From this sentence we understand that certain offenses can be forgiven in this age, but certain others in the age to come.

1032 This teaching is also based on the practice of prayer for the dead, already mentioned in Sacred Scripture: "Therefore Judas Maccabeus made atonement for the dead, that they might be delivered from their sin." From the beginning the Church has honored the memory of the dead and offered prayers in suffrage for them, above all the Eucharistic sacrifice, so that, thus purified, they may attain the beatific vision of God. The Church also commends almsgiving, indulgences, and works of penance undertaken on behalf of the dead:
Let us help and commemorate them. If Job's sons were purified by their father's sacrifice, why would we doubt that our offerings for the dead bring them some consolation? Let us not hesitate to help those who have died and to offer our prayers for them.

What Did Jesus Teach?

“Who, then, is the faithful and prudent steward whom the master will put in charge of his servants to distribute [the] food allowance at the proper time? Blessed is that servant whom his master on arrival finds doing so. Truly, I say to you, he will put him in charge of all his property. But if that servant says to himself, ‘My master is delayed in coming,’ and begins to beat the menservants and the maidservants, to eat and drink and get drunk, then that servant’s master will come on an unexpected day and at an unknown hour and will punish him severely and assign him a place with the unfaithful. That servant who knew his master’s will but did not make preparations nor act in accord with his will shall be beaten severely; and the servant who was ignorant of his master’s will but acted in a way deserving of a severe beating shall be beaten only lightly. Much will be required of the person entrusted with much, and still more will be demanded of the person entrusted with more." (Luke 12:42-48)

What Does The Rest Of The Bible Teach?

In the year King Uzziah died, I saw the Lord seated on a high and lofty throne, with the train of his garment filling the temple. Seraphim were stationed above; each of them had six wings: with two they covered their faces, with two they covered their feet, and with two they hovered. One cried out to the other: “Holy, holy, holy is the LORD of hosts! All the earth is filled with his glory!” At the sound of that cry, the frame of the door shook and the house was filled with smoke. Then I said, “Woe is me, I am doomed! For I am a man of unclean lips, living among a people of unclean lips, and my eyes have seen the King, the LORD of hosts!” Then one of the seraphim flew to me, holding an ember which he had taken with tongs from the altar. He touched my mouth with it. “See,” he said, “now that this has touched your lips, your wickedness is removed, your sin purged.” (Isaiah 6:1-7)

Judas rallied his army and went to the city of Adullam. As the seventh day was approaching, they purified themselves according to custom and kept the sabbath there. On the following day, since the task had now become urgent, Judas and his companions went to gather up the bodies of the fallen and bury them with their kindred in their ancestral tombs. But under the tunic of each of the dead they found amulets sacred to the idols of Jamnia, which the law forbids the Jews to wear. So it was clear to all that this was why these men had fallen. They all therefore praised the ways of the Lord, the just judge who brings to light the things that are hidden. Turning to supplication, they prayed that the sinful deed might be fully blotted out. The noble Judas exhorted the people to keep themselves free from sin, for they had seen with their own eyes what had happened because of the sin of those who had fallen. He then took up a collection among all his soldiers, amounting to two thousand silver drachmas, which he sent to Jerusalem to provide for an expiatory sacrifice. In doing this he acted in a very excellent and noble way, inasmuch as he had the resurrection in mind; for if he were not expecting the fallen to rise again, it would have been superfluous and foolish to pray for the dead. But if he did this with a view to the splendid reward that awaits those who had gone to rest in godliness, it was a holy and pious thought. Thus he made atonement for the dead that they might be absolved from their sin. (2 Maccabees 12:38-46)

According to the grace of God given to me, like a wise master builder I laid a foundation, and another is building upon it. But each one must be careful how he builds upon it, for no one can lay a foundation other than the one that is there, namely, Jesus Christ. If anyone builds on this foundation with gold, silver, precious stones, wood, hay, or straw, the work of each will come to light, for the Day will disclose it. It will be revealed with fire, and the fire [itself] will test the quality of each one’s work. If the work stands that someone built upon the foundation, that person will receive a wage. But if someone’s work is burned up, that one will suffer loss; the person will be saved, but only as through fire. (1 Corinthians 3:10-15)

What Did The Church Fathers Teach?
(The following quotations can be found at Churchfathers.org)

“And after the exhibition, Tryphaena again received her [Thecla]. For her daughter Falconilla had died, and said to her in a dream: ‘Mother, you shall have this stranger Thecla in my place, in order that she may pray concerning me, and that I may be transferred to the place of the righteous.’” (Acts of Paul and Thecla [A.D. 160])

“The citizen of a prominent city, I erected this while I lived, that I might have a resting place for my body. Abercius is my name, a disciple of the chaste Shepherd who feeds his sheep on the mountains and in the fields, who has great eyes surveying everywhere, who taught me the faithful writings of life. Standing by, I, Abercius, ordered this to be inscribed: Truly, I was in my seventy-second year. May everyone who is in accord with this and who understands it pray for Abercius.” (Abercius, Epitaph of Abercius [A.D. 190])

“[T]hat very night, this was shown to me in a vision: I [Perpetua] saw Dinocrates going out from a gloomy place, where also there were several others, and he was parched and very thirsty, with a filthy countenance and pallid color, and the wound on his face which he had when he died. This Dinocrates had been my brother after the flesh, seven years of age, who died miserably with disease. . . . For him I had made my prayer, and between him and me there was a large interval, so that neither of us could approach to the other . . . and [I] knew that my brother was in suffering. But I trusted that my prayer would bring help to his suffering; and I prayed for him every day until we passed over into the prison of the camp, for we were to fight in the camp-show. Then . . . I made my prayer for my brother day and night, groaning and weeping that he might be granted to me. Then, on the day on which we remained in fetters, this was shown to me: I saw that the place which I had formerly observed to be in gloom was now bright; and Dinocrates, with a clean body well clad, was finding refreshment. . . . [And] he went away from the water to play joyously, after the manner of children, and I awoke. Then I understood that he was translated from the place of punishment.” (The Martyrdom of Perpetua and Felicity 2:3–4 [A.D. 202])

“We offer sacrifices for the dead on their birthday anniversaries [the date of death—birth into eternal life].” (Tertullian, The Crown 3:3 [A.D. 211])

“A woman, after the death of her husband . . . prays for his soul and asks that he may, while waiting, find rest; and that he may share in the first resurrection. And each year, on the anniversary of his death, she offers the sacrifice.” (Tertullian, Monogamy 10:1–2 [A.D. 216])

“The strength of the truly believing remains unshaken; and with those who fear and love God with their whole heart, their integrity continues steady and strong. For to adulterers even a time of repentance is granted by us, and peace [i.e., reconciliation] is given. Yet virginity is not therefore deficient in the Church, nor does the glorious design of continence languish through the sins of others. The Church, crowned with so many virgins, flourishes; and chastity and modesty preserve the tenor of their glory. Nor is the vigor of continence broken down because repentance and pardon are facilitated to the adulterer. It is one thing to stand for pardon, another thing to attain to glory; it is one thing, when cast into prison, not to go out thence until one has paid the uttermost farthing; another thing at once to receive the wages of faith and courage. It is one thing, tortured by long suffering for sins, to be cleansed and long purged by fire; another to have purged all sins by suffering. It is one thing, in fine, to be in suspense till the sentence of God at the day of judgment; another to be at once crowned by the Lord.” (Cyprian of Carthage, Letters 51[55]:20 [A.D. 253])

“Then we make mention also of those who have already fallen asleep: first, the patriarchs, prophets, apostles, and martyrs, that through their prayers and supplications God would receive our petition; next, we make mention also of the holy fathers and bishops who have already fallen asleep, and, to put it simply, of all among us who have already fallen asleep, for we believe that it will be of very great benefit to the souls of those for whom the petition is carried up, while this holy and most solemn sacrifice is laid out.” (Cyril of Jerusalem, Catechetical Lectures 23:5:9 [A.D. 350])

“If a man distinguish in himself what is peculiarly human from that which is irrational, and if he be on the watch for a life of greater urbanity for himself, in this present life he will purify himself of any evil contracted, overcoming the irrational by reason. If he has inclined to the irrational pressure of the passions, using for the passions the cooperating hide of things irrational, he may afterward in a quite different manner be very much interested in what is better, when, after his departure out of the body, he gains knowledge of the difference between virtue and vice and finds that he is not able to partake of divinity until he has been purged of the filthy contagion in his soul by the purifying fire.” (Gregory of Nyssa, Sermon on the Dead [A.D. 382])

“Let us help and commemorate them. If Job’s sons were purified by their father’s sacrifice [Job 1:5], why would we doubt that our offerings for the dead bring them some consolation? Let us not hesitate to help those who have died and to offer our prayers for them.” (John Chrysostom, Homilies on First Corinthians 41:5 [A.D. 392])

“Weep for those who die in their wealth and who with all their wealth prepared no consolation for their own souls, who had the power to wash away their sins and did not will to do it. Let us weep for them, let us assist them to the extent of our ability, let us think of some assistance for them, small as it may be, yet let us somehow assist them. But how, and in what way? By praying for them and by entreating others to pray for them, by constantly giving alms to the poor on their behalf. Not in vain was it decreed by the apostles that in the awesome mysteries remembrance should be made of the departed. They knew that here there was much gain for them, much benefit. When the entire people stands with hands uplifted, a priestly assembly, and that awesome sacrificial Victim is laid out, how, when we are calling upon God, should we not succeed in their defense? But this is done for those who have departed in the faith, while even the catechumens are not reckoned as worthy of this consolation, but are deprived of every means of assistance except one. And what is that? We may give alms to the poor on their behalf.” (John Chrysostom, Homilies on Philippians 3:9–10 [A.D. 402])

“There is an ecclesiastical discipline, as the faithful know, when the names of the martyrs are read aloud in that place at the altar of God, where prayer is not offered for them. Prayer, however, is offered for other dead who are remembered. It is wrong to pray for a martyr, to whose prayers we ought ourselves be commended.” (Augustine, Sermons 159:1 [A.D. 411])

"But by the prayers of the holy Church, and by the salvific sacrifice, and by the alms which are given for their spirits, there is no doubt that the dead are aided, that the Lord might deal more mercifully with them than their sins would deserve. The whole Church observes this practice which was handed down by the Fathers: that it prays for those who have died in the communion of the Body and Blood of Christ, when they are commemorated in their own place in the sacrifice itself; and the sacrifice is offered also in memory of them, on their behalf. If, then, works of mercy are celebrated for the sake of those who are being remembered, who would hesitate to recommend them, on whose behalf prayers to God are not offered in vain? It is not at all to be doubted that such prayers are of profit to the dead; but for such of them as lived before their death in a way that makes it possible for these things to be useful to them after death.” (ibid., 172:2)

“Temporal punishments are suffered by some in this life only, by some after death, by some both here and hereafter, but all of them before that last and strictest judgment. But not all who suffer temporal punishments after death will come to eternal punishments, which are to follow after that judgment.” (Augustine, The City of God 21:13 [A.D. 419])

“That there should be some fire even after this life is not incredible, and it can be inquired into and either be discovered or left hidden whether some of the faithful may be saved, some more slowly and some more quickly in the greater or lesser degree in which they loved the good things that perish, through a certain purgatorial fire.” (Augustine, Handbook on Faith, Hope, and Charity 18:69 [A.D. 421])

“The time which interposes between the death of a man and the final resurrection holds souls in hidden retreats, accordingly as each is deserving of rest or of hardship, in view of what it merited when it was living in the flesh. Nor can it be denied that the souls of the dead find relief through the piety of their friends and relatives who are still alive, when the Sacrifice of the Mediator [Mass] is offered for them, or when alms are given in the Church. But these things are of profit to those who, when they were alive, merited that they might afterward be able to be helped by these things. There is a certain manner of living, neither so good that there is no need of these helps after death, nor yet so wicked that these helps are of no avail after death” (ibid., 29:109)

What Have The Popes And The Magisterium Taught?

Whereas the Catholic Church, instructed by the Holy Ghost, has, from the sacred writings and the ancient tradition of the Fathers, taught, in sacred councils, and very recently in this ecumenical Synod, that there is a Purgatory, and that the souls there detained are helped by the suffrages of the faithful, but principally by the acceptable sacrifice of the altar; the holy Synod enjoins on bishops that they diligently endeavor that the sound doctrine concerning Purgatory, transmitted by the holy Fathers and sacred councils, be believed, maintained, taught, and every where proclaimed by the faithful of Christ. But let the more difficult and subtle questions, and which tend not to edification, and from which for the most part there is no increase of piety, be excluded from popular discourses before the uneducated multitude. In like manner, such things as are uncertain, or which labour under an appearance of error, let them not allow to be made public and treated of. While those things which tend to a certain kind of curiosity or superstition, or which savor of filthy lucre, let them prohibit as scandals and stumbling-blocks of the faithful. But let the bishops take care, that the suffrages of the faithful who are living, to wit the sacrifices of masses, prayers, alms, and other works of piety, which have been wont to be performed by the faithful for the other faithful departed, be piously and devoutly performed, in accordance with the institutes of the church; and that whatsoever is due on their behalf, from the endowments of testators, or in other way, be discharged, not in a perfunctory manner, but diligently and accurately, by the priests and ministers of the church, and others who are bound to render this (service). Decree Concerning Purgatory, General Council of Trent: Twenty-Fifth Session - 1563.

A further point must be mentioned here, because it is important for the practice of Christian hope. Early Jewish thought includes the idea that one can help the deceased in their intermediate state through prayer (see for example 2 Macc 12:38-45; first century BC). The equivalent practice was readily adopted by Christians and is common to the Eastern and Western Church. The East does not recognize the purifying and expiatory suffering of souls in the afterlife, but it does acknowledge various levels of beatitude and of suffering in the intermediate state. The souls of the departed can, however, receive “solace and refreshment” through the Eucharist, prayer and almsgiving. The belief that love can reach into the afterlife, that reciprocal giving and receiving is possible, in which our affection for one another continues beyond the limits of death—this has been a fundamental conviction of Christianity throughout the ages and it remains a source of comfort today. Who would not feel the need to convey to their departed loved ones a sign of kindness, a gesture of gratitude or even a request for pardon? Now a further question arises: if “Purgatory” is simply purification through fire in the encounter with the Lord, Judge and Saviour, how can a third person intervene, even if he or she is particularly close to the other? When we ask such a question, we should recall that no man is an island, entire of itself. Our lives are involved with one another, through innumerable interactions they are linked together. No one lives alone. No one sins alone. No one is saved alone. The lives of others continually spill over into mine: in what I think, say, do and achieve. And conversely, my life spills over into that of others: for better and for worse. So my prayer for another is not something extraneous to that person, something external, not even after death. In the interconnectedness of Being, my gratitude to the other—my prayer for him—can play a small part in his purification. And for that there is no need to convert earthly time into God's time: in the communion of souls simple terrestrial time is superseded. It is never too late to touch the heart of another, nor is it ever in vain. In this way we further clarify an important element of the Christian concept of hope. Our hope is always essentially also hope for others; only thus is it truly hope for me too. As Christians we should never limit ourselves to asking: how can I save myself? We should also ask: what can I do in order that others may be saved and that for them too the star of hope may rise? Then I will have done my utmost for my own personal salvation as well. Spe Salvi, Pope Benedict XVI - November 30, 2007.