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The belief in everlasting punishment did not originate with the RCC or King James translation, but goes back as far as the earliest Christians, as the following quotations show. Aionios has been translated consistent with the historic belief. Note the words "for an endless duration", "punished unceasingly", "not merely temporal, but eternal", etc., which leave no doubt about mistranslation. You can easily see how they understood Jesus' words in Matthew 25:This word "aionios" has traditionally been translated as "eternal" by the RCC and then by the KJV and then etched in stone by the subsequent translations.
150 AD Second Clement "If we do the will of Christ, we shall obtain rest; but if not, if we neglect his commandments, nothing will rescue us from eternal punishment" (Second Clement 5:5).
150 AD Justin Martyr: "No more is it possible for the evildoer, the avaricious, and the treacherous to hide from God than it is for the virtuous. Every man will receive the eternal punishment or reward which his actions deserve. Indeed, if all men recognized this, no one would choose evil even for a short time, knowing that he would incur the eternal sentence of fire. On the contrary, he would take every means to control himself and to adorn himself in virtue, so that he might obtain the good gifts of God and escape the punishments" (First Apology 12).
150 AD Justin Martyr: "We have been taught that only they may aim at immortality who have lived a holy and virtuous life near to God. We believe that they who live wickedly and do not repent will be punished in everlasting fire" (First Apology, 21).
150 AD Justin Martyr: "[Jesus] shall come from the heavens in glory with his angelic host, when he shall raise the bodies of all the men who ever lived. Then he will clothe the worthy in immortality; but the wicked, clothed in eternal sensibility, he will commit to the eternal fire, along with the evil demons" (First Apology, 52).
150 AD Justin Martyr: and we say that the same thing will be done, but at the hand of Christ, and upon the wicked in the same bodies united again to their spirits which are now to undergo everlasting punishment; and not only, as Plato said, for a period of a thousand years. And if any one say that this is incredible or impossible, this error of ours is one which concerns ourselves only, and no other person, so long as you cannot convict us of doing any harm. (The First Apology of Justin, Chap. VIII)
150 AD Justin Martyr: For among us the prince of the wicked spirits is called the serpent, and Satan, and the devil, as you can learn by looking into our writings. And that he would be sent into the fire with his host, and the men who follow him, and would be punished for an endless duration, Christ foretold. (The First Apology of Justin, Chap. XXVIII)
150 AD Justin Martyr: the unjust and intemperate shall be punished in eternal fire. (The Second Apology of Justin For The Christians Addressed to the Roman Senate, Chap. I)
150 AD Justin Martyr: assuring him that there shall be punishment in eternal fire inflicted upon those who do not live temperately and conformably to right reason. (The Second Apology of Justin for the Christians Addressed to the Roman Senate. Chap. II)
150 AD Justin Martyr: And they, having been shut up in eternal fire, shall suffer their just punishment and penalty. For if they are even now overthrown by men through the name of Jesus Christ, this is an intimation of the punishment in eternal fire which is to be inflicted on themselves and those who serve them. For thus did both all the prophets foretell, and our own teacher Jesus teach. (The Second Apology of Justin for the Christians Addressed to the Roman Senate, Chap. VIII)
150 AD Justin Martyr: And that no one may say what is said by those who are deemed philosophers, that our assertions that the wicked are punished in eternal fire are big words and bugbears, and that we wish men to live virtuously through fear, and not because such a life is good and pleasant; I will briefly reply to this, that if this be not so, God does not exist; or, if He exists, He cares not for men, and neither virtue nor vice is anything, and as we said before, lawgivers unjustly punish those who transgress good commandments. (The Second Apology of Justin for the Christians Addressed to the Roman Senate, Chap. IX)
150 AD Justin Martyr: when some are sent to be punished unceasingly into judgment and condemnation of fire; but others shall exist in freedom from suffering, from corruption, and from grief, and in immortality." (Dialogue of Justin, Philosopher and Martyr with Trypho, A Jew, Chap. XLV)
155 AD The Martyrdom of Polycarp "Fixing their minds on the grace of Christ, [the martyrs] despised worldly tortures and purchased eternal life with but a single hour. To them, the fire of their cruel torturers was cold. They kept before their eyes their escape from the eternal and unquenchable fire" (Martyrdom of Polycarp 2:3).
160 AD Mathetes "When you know what is the true life, that of heaven; when you despise the merely apparent death, which is temporal; [/u]when you fear the death which is real, and which is reserved for those who will be condemned to the everlasting fire, the fire which will punish even to the end[/u] those who are delivered to it, then you will condemn the deceit and error of the world" (Letter to Diognetus 10:7).
181 AD Theophilus of Antioch "Give studious attention to the prophetic writings [the Bible] and they will lead you on a clearer path to escape the eternal punishments and to obtain the eternal good things of God.. [God] will examine everything and will judge justly, granting recompense to each according to merit. To those who seek immortality by the patient exercise of good works, he will give everlasting life, joy, peace, rest, and all good things.. For the unbelievers and for the contemptuous, and for those who do not submit to the truth but assent to iniquity, when they have been involved in adulteries, and fornications, and homosexualities, and avarice, and in lawless idolatries, there will be wrath and indignation, tribulation and anguish; and in the end, such men as these will be detained in everlasting fire" (To Autolycus 1:14).
189 AD Irenaeus of Lyons "[God will] send the spiritual forces of wickedness, and the angels who transgressed and became apostates, and the impious, unjust, lawless, and blasphemous among men into everlasting fire" (Against Heresies 1:10:1).
189 AD Irenaeus of Lyons "The penalty increases for those who do not believe the Word of God and despise his coming ... it is not merely temporal, but eternal. To whomsoever the Lord shall say, 'Depart from me, accursed ones, into the everlasting fire,' they will be damned forever" (Against Heresies, 4:28:2).
197 AD Tertullian "After the present age is ended he will judge his worshipers for a reward of eternal life and the godless for a fire equally perpetual and unending" (Apology 18:3).
197 AD Tertullian "Then will the entire race of men be restored to receive its just deserts according to what it has merited in this period of good and evil, and thereafter to have these paid out in an immeasurable and unending eternity. Then there will be neither death again nor resurrection again, but we shall be always the same as we are now, without changing. The worshippers of God shall always be with God, clothed in the proper substance of eternity. But the godless and those who have not turned wholly to God will be punished in fire equally unending, and they shall have from the very nature of this fire, divine as it were, a supply of incorruptibility" (Apology , 44:12-13).
212 AD Hippolytus "Standing before [Christ's] judgment, all of them, men, angels, and demons, crying out in one voice, shall say: 'Just if your judgment!' And the righteousness of that cry will be apparent in the recompense made to each. To those who have done well, everlasting enjoyment shall be given; while to the lovers of evil shall be given eternal punishment. The unquenchable and unending fire awaits these latter, and a certain fiery worm which does not die and which does not waste the body but continually bursts forth from the body with unceasing pain. No sleep will give them rest; no night will soothe them; no death will deliver them from