Is anyone intelligent enough to come to terms with "for ever"?
I don't think it has anything to do with intelligence, the limitations are surely on the viability of human life on earth.

You scientists are so good at guessing games, how many centuries have humans got left? If we accept the evolutionary theory we have only been here a very short time and have made an excellent job of fucking up the environment, now we have moved into the realms of genetic engineering, building deadly viruses, manufacturing shedloads of drugs to protect ourselves from the results of our stupid behaviour.

The clock is ticking for humanity, but the universe will always be there, any attempt to rationalise the unknowable is time poorly spent.
Would we not be better to spend our last few hours fighting back?