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Fire

Fire has an important place in the popular image of purgatory and has been the object of speculation by theologians, speculation to which the article on purgatory in the Catholic Encyclopedia relates the warning by the Council of Trent against "difficult and subtle questions which tend not to edification."

Fire has never been included in the Catholic Church's defined doctrine on purgatory, but speculation about it is traditional. "The tradition of the Church, by reference to certain texts of Scripture, speaks of a cleansing fire." In this regard the Catechism of the Catholic Church references in particular two New Testament passages: "If anyone's work is burned up, he will suffer loss, though he himself will be saved, but only as through fire" and "so that the tested genuineness of your faith—more precious than gold that perishes though it is tested by fire—may be found to result in praise and glory and honor at the revelation of Jesus Christ". Catholic theologians have also cited verses such as "I will put this third into the fire, and refine them as one refines silver, and test them as gold is tested. They will call upon my name, and I will answer them. I will say, 'They are my people'; and they will say, 'The LORD is my God'", a verse that the Jewish school of Shammai applied to God's judgment on those who are not completely just nor entirely evil.

Use of the image of a purifying fire goes back as far as Origen who, with reference to 1 Corinthians 3:10–15, seen as referring to a process by which the dross of lighter transgressions will be burnt away, and the soul, thus purified, will be saved, wrote:

"Suppose you have built, after the foundation which Christ Jesus has taught, not only gold, silver, and precious stones − if indeed you possess gold and much silver or little − suppose you have silver, precious stones, but I say not only these elements, but suppose that you have also wood and hay and stubble, what does he wish you to become after your final departure? To enter afterwards then into the holy lands with your wood and with your hay and stubble so that you may defile the Kingdom of God? But again do you want to be left behind in the fire on account of the hay, the wood, the stubble, and to receive nothing due you for the gold and the silver and precious stone ? That is not reasonable. What then? It follows that you receive the fire first due to the wood, and the hay and the stubble. For to those able to perceive, our God is said to be in reality a consuming fire."

Origen also speaks of a refining fire melting away the lead of evil deeds, leaving behind only pure gold.

Augustine tentatively put forward the idea of a post-death purgatorial fire for some Christian believers:

"69. It is not incredible that something like this should occur after this life, whether or not it is a matter for fruitful inquiry. It may be discovered or remain hidden whether some of the faithful are sooner or later to be saved by a sort of purgatorial fire, in proportion as they have loved the goods that perish, and in proportion to their attachment to them."

Gregory the Great also argued for the existence, before Judgment, of a purgatorius ignis (a cleansing fire) to purge away minor faults (wood, hay, stubble) not mortal sins (iron, bronze, lead). Pope Gregory, in the Dialogues, quotes Christ's words (in Mat 12:32) to establish purgatory:

"But yet we must believe that before the day of judgment there is a purgatory fire for certain small sins: because our Saviour saith, that he which speaketh blasphemy against the holy Ghost, that it shall not be forgiven him, neither in this world, nor in the world to come. (Mat 12:32) Out of which sentence we learn, that some sins are forgiven in this world, and some other may be pardoned in the next: for that which is denied concerning one sin, is consequently understood to be granted touching some other."

Gregory of Nyssa several times spoke of purgation by fire after death, but he generally has apocatastasis in mind.

Medieval theologians accepted the association of purgatory with fire. Thus the Summa Theologica of Thomas Aquinas considered it probable that Purgatory was situated close to hell, so that the same fire that tormented the damned cleansed the just souls in Purgatory.

Ideas about the supposed fire of purgatory have changed with time: in the early 20th century the Catholic Encyclopedia reported that, while in the past most theologians had held that the fire of purgatory was in some sense a material fire, though of a nature different from ordinary fire, the view of what then seemed to be the majority of theologians was that the term was to be understood metaphorically.