At the Council of Ferrara-Florence, the matter of purgatorial (material) hellfire was discussed:
They remarked, that the words quoted from the book of Maccabees, and our Saviour's words, can only prove that some sins will be forgiven after death; but whether by means of punishment by fire, or by other means, nothing was known for certain. Besides, what has forgiveness of sins to do with punishment by fire and tortures? Only one of these two things can happen: either punishment or forgiveness, and not both at once.
In explanation of the Apostle's words, they quoted the commentary of S. John Chrysostom, who, using the word
fire, gives it the meaning of an eternal, and not temporary, purgatorial fire; explains the words
wood, hay, stubble, in the sense of bad deeds, as food for the eternal fire; the word
day, as meaning the day of the last judgment; and the words
saved yet so as by fire, as meaning the preservation and continuance of the sinner's existence while suffering punishment. Keeping to this explanation, they reject the other explanation given by S. Augustine, founded on the words
shall be saved, which he understood in the sense of
bliss, and consequently gave quite another meaning to all this quotation. "It is very right to suppose," wrote the Orthodox teachers, "that the Greeks should understand Greek words better than foreigners. Consequently, if we cannot prove that any one of those saints, who spoke the Greek language, explains the Apostle's words, written in Greek, in a sense different to that given by the blessed John, then surely we must agree with the majority of these Church celebrities." The expressions
sothenai, sozesthai, and
soteria, used by heathen writers, mean in our language continuance, existence (
diamenein, einai.) The very idea of the Apostle's words shows this. As fire naturally destroys, whereas those who are doomed to eternal fire are not destroyed, the Apostle says that they continue in fire, preserving and continuing their existence, though at the same time they are being burned by fire. To prove the truth of such an explanation of these words by the Apostle, (ver. 11, 15,) they make the following remarks: The Apostle divides all that is
built upon the proposed
foundation into two parts, never even hinting of any third, middle part. By
gold, silver, stones, he means virtues; by
hay, wood, stubble, that which is contrary to virtue, i. e., bad works. "Your doctrine," they continued to tell the Latins, "would perhaps have had some foundation if he (the Apostle) had divided bad works into two kinds, and bad said that one kind is purified by God, and the other worthy of eternal punishment. But he made no such division; simply naming the works entitling man to eternal bliss, i.e., virtues, and those meriting eternal punishment, i.e., sins. After which he says, 'Every man's work shall be made manifest,' and shows when this will happen, pointing to that last day, when God will render unto all according to their merits: 'For the day,' he says, 'shall declare it, because it shall be revealed by fire.' Evidently, this is the day of the second coming of Christ, the coming age, the
day so called in a particular sense, or as opposed to the present life, which is but night. This is the day when He will come in glory, and a fiery stream shall precede Him. (Dan. vii. 10; Ps. 1. 3; xcvii. 3; 2 S. Pet. iii. 12, 15.) All this shows us that S. Paul speaks here of the last day, and of the eternal fire prepared for sinners. 'This fire,' says he, 'shall try every man's work of what sort it is,' enlightening some works, and burning others with the workers. But when the evil deed will be destroyed by fire, the evil doers will not be destroyed also, but will continue their existence in the fire, and suffer eternally. Whereas then the Apostle does not divide sins here into mortal and venial, but deeds in general into good and bad; whereas the time of this event is referred by him to the final day, as by the Apostle Peter also; whereas, again, he attributes to the fire the power of destroying all evil actions, but not the doers; it becomes evident that the Apostle Paul does not speak of purgatorial fire, which, even in your opinion, extends not over all evil actions, but over some of the minor sins. But these words also, 'If any man's work shall be burned, he shall suffer loss,' (
zemiothesetai, i.e., shall lose,) shows that the Apostle speaks of the eternal tortures; they are
deprived of the Divine light: whereas this cannot be spoken of those purified, as you say; for they not only do not lose anything, but even acquire a great deal, by being freed from evil, and clothed in purity and candour.
St Mark of Ephesus First Homily on the subject:
http://nftu.net/first-homily-of-st-mark-of-ephesus-on-prayer-for-the-dead-and-against-the-roman-catholic-purgatory/