Forever?

It would be hell to live forever in our current, corrupted state; a true living hell. However, the Eternal Life God gives to those who love Him is a thing which He Himself promises is far beyond our comprehension.
But as help in understanding, He has given us the butterfly: When the worm is reborn into it's 'new world', it is no longer the 'old worm' but a newborn butterfly. For us, the next world is similar. Like the worm, the transformation is far beyond our current comprehension. It is a WHOLE new existence.
"...the things that no eye has seen and no ear has heard, things beyond the mind of man, all that God has prepared for those who love him."
-Paul, in 1st Corinthians
"'...Now, at the resurrection, to which of them will she be wife since she had been married to all seven?'
Jesus replied, 'The children of this world take wives and husbands, but those who are judged worthy of a place in the other world and in the resurrection from the dead do not marry because they can no longer die, for they are the same as the angels, and being children of the resurrection they are sons of God. And Moses himself implies that the dead rise again, in the passage about the bush where he calls the Lord the God of Abraham, the God of Isaac and the God of Jacob. Now he is God, not of the dead, but of the living; for to him all men are in fact alive.'"
-Jesus, in the book of Luke
"It is the spirit that gives life, the flesh has nothing to offer. The words I have spoken to you are spirit and they are life."
-Jesus, in the book of John
"A woman in childbirth suffers,
because her time has come;
but when she has given birth to the child she forgets the suffering in her joy that a man has been born into the world.
So it is with you: you are sad now,
but I shall see you again, and your hearts will be full of joy,
and that joy no one shall take from you."

-Jesus, in the book of John
"Someone may ask, 'How are dead people raised, and what sort of body do they have when they come back? They are stupid questions. Whatever you sow in the ground has to die before it is given new life and the thing that you sow is not what is going to come; you sow a bare grain, say of wheat or something like that, and then God gives it the sort of body that he has chosen: each sort of seed gets its own sort of body.
Everything that is flesh is not the same flesh: there is human flesh, animals' flesh, the flesh of birds and the flesh of fish. Then there are heavenly bodies and there are earthly bodies; but the heavenly bodies have a beauty of their own and the earthly bodies a different one. The sun has its brightness, the moon a different brightness, and the stars a different brightness, and the stars differ from each other in brightness. It is the same with the resurrection of the dead: the thing that is sown is perishable but what is raised is imperishable; the thing that is sown is contemptible but what is raised is glorious; the thing that is sown is weak but what is raised is powerful; when it is sown it embodies the soul, when it is raised it embodies the spirit.
If the soul has its own embodiment, so does the spirit have its own embodiment. The first man, Adam, as scripture says, became a living soul; but the last Adam has become a life-giving spirit. That is, first man, being from earth, is earthly by nature; the second man is from heaven. As this earthly man was, so are we on earth; and as the heavenly man is, so are we in heaven. And we, who have been modeled on the earthly man, will be modeled on the heavenly man.
Or else, brothers, put it this way: flesh and blood cannot inherit the kingdom of God: and the perishable cannot inherit what lasts for ever. I will tell you something that has been secret: that we are not all going to die, but we shall all be changed. This will be instantaneous, in the twinkling of an eye, when the last trumpet sounds. It will sound, and the dead will be raised, imperishable, and we shall be changed as well, because our present perishable nature must put on imperishability and this mortal nature must put on immortality.
When this perishable nature has put on imperishability, and when this mortal nature has put on immortality, then the words of scripture will come true: Death is swallowed up in victory. Death, where is your victory? Death, where is your sting?"
-Paul, in 1st Corinthians