On the surface there is a significant amount of support for the doctrine of eternal torment. And God did use extreme physical discomfort in his forms of punishment for certain crimes.
The whip that was used for a maximum of 40 lashes was one nasty little instrument for inflicting tremendous pain that could correctly be called torture. These whips were designed with knots and streamers that would literally fillet the flesh off of the back of the person being whipped.
So much for the bad news
On the other hand the word in the original languages that was translated as "eternity," lost a lot of it's meaning during the translation process. What the word really means is “an age” that has both a beginning and an end to it. in other words God never prescribed a punishment of pain for anyone that did not end when the sentence was filled by the offender
This goes hand-in-hand with the purpose of God's law that had maximum limits set to the sentence and when the person had fulfilled their sentence they could return to society with all the rights and privileges normally associated with persons in good standing.
Jesus Himself taught this same principal,
Matt. 5:25 Agree with thine adversary quickly, whiles thou art in the way with him; lest at any time the adversary deliver thee to the judge, and the judge deliver thee to the officer, and thou be cast into prison.
26 Verily I say unto thee, Thou shalt by no means come out thence, till thou hast paid the uttermost farthing.
Other than repenting from threats to punish or destroy the offenders God does not change. God's law is a “fiery law” whose purpose is to burn off what is unacceptable about a person. This is something else that Jesus taught when he compared people in the fire as being the same as the dump outside of Jerusalem where the fires burn continuously. However, the reason why they continued to burn was there was a continuous source of fuel being added daily that caused the fire to continue to burn.
On the other hand had the fuel been exhausted the fire would've gone out. The implication is quite clear that if a person was “burning in hell” there was a set time limit that would not end before the person had been through the fires of correction and they had done what they were designed to do.
Paul also taught this,
Here Paul is speaking of Christians who has some chaff and some stubble that needed to be removed before the person could become fully sanctified.
1Corr. 3:10 According to the grace of God which is given unto me, as a wise masterbuilder, I have laid the foundation, and another buildeth thereon. But let every man take heed how he buildeth thereupon.
11 For other foundation can no man lay than that is laid, which is Jesus Christ.
12 Now if any man build upon this foundation gold, silver, precious stones, wood, hay, stubble;
13 Every man's work shall be made manifest: for the day shall declare it, because it shall be revealed by fire; and the fire shall try every man's work of what sort it is.
14 If any man's work abide which he hath built thereupon, he shall receive a reward.
15 If any man's work shall be burned, he shall suffer loss: but he himself shall be saved; yet so as by fire.
In the above verses Paul is saying that someone who adds doctrines on top of the foundation of Christ that are not true (and are a sin) their mind needs to be purified and it will be purified. However, the purpose behind the fire is good even though it is a painful process to endure.
This was the purpose of the fire seen on the heads of the apostles and disciples that was the Holy Spirit given on Pentecost that was to prepare them to be able to receive the fulness of God in their hearts. Fire is a purifying fire the same as God's law is a fiery law. Much better to “be saved by fire” in this life through whatever fire God comes up with in order to get someone to worship in spirit and in truth.
Jesus also spoke of servants in the next life who knew their father's will for them but did not do it would be receiving multiple lashes but the person who did not know their fathers will was not punished as severely. In case you missed it these are Christians being whipped in the next life for not doing what they should have done in this life
The 2nd covenant is a better covenant simply because one way or the other people are going to be made acceptable to God through the cleansing of the fires that are for the purpose of purifying albeit the time spent in the fire will be very painful.