Yes, I believe it is beyond our comprehension.
There are some who hold to annihilation, so I take it this must mean those suffering in hell now, for 'thousands of years' cannot wait for the consummation of the age so they can get relief from their torment. This is only one reason I reject the theory of non eternal suffering and punishment.
It seems many want to reject this vital truth. The only reason I can imagine is they allow their own feelings and sentiments to be their guide. It is a matter of measuring the yardstick by the cloth. When we look at Scripture and see that this is, indeed, how God punishes sin, then we must take a lesson on the severity of sin. I have often heard men criticize saying, 'Are you saying that I will suffer forever and ever for a lie or getting drunk, et.' You see what they do? They depreciate their sin and the severity of it rather than to acknowledge that its heinous nature is seen in the punishment an all holy God whose judgement are altogether righteous gives to sin.
Then without thinking, those who call Jesus their Lord and Savior profane His sacrifice by denying this truth because Jesus bore in Himself the sins of His people and drank to the full the cup of the wrath of God against sin. They also make themselves wiser than God who has shown these things by plain illustration. If there are any reading this board who have a contrary opinion consider the following:
Mark 9
43 And if thy hand offend thee, cut it off: it is better for thee to enter into life maimed, than having two hands to go into hell, into the fire that never shall be quenched:
44 Where their worm dieth not, and the fire is not quenched.
45 And if thy foot offend thee, cut it off: it is better for thee to enter halt into life, than having two feet to be cast into hell, into the fire that never shall be quenched:
46 Where their worm dieth not, and the fire is not quenched.
47 And if thine eye offend thee, pluck it out: it is better for thee to enter into the kingdom of God with one eye, than having two eyes to be cast into hell fire:
48 Where their worm dieth not, and the fire is not quenched.
The worm here are maggots and if we can all understand fire. Here is a hideous illustration of a worm that is everlastingly consuming an unconsummable body. Here is a fire that everlasting burns that fuel that can never be burned up. Isaiah spoke this also as we see in Isaiah 66:24
And they shall go forth, and look upon the carcasses of the men that transgressed against me: for their worm shall not die, neither shall their fire be quenched; and they shall be an abhorring unto all flesh.
To imagine any supposed annihilation is an invention of the minds of men. See what the prophets have said and moreover our Lord Jesus Christ. And take the lesson well. Cast sin away from you and turn from it.