He didn't have to push the rock up the hill, but it never occurred to him. Instead, he was compelled to do so by those in whom he believed.
Would he have experienced the same satisfaction had he simply left the rock in the place where it came to rest each morning? Would he have been able to experience his eternity in a different manner, or would he simply have been punished in some other way?
I have a compulsion to push the rock. Perhaps it's because I don't see any other way. There are other possibilities, yet I still toil at this seemingly unfulfillable task. Is it fear of a different, more dreadful punishment, or is it because I fear the possibilities that I cannot predict?
Argue your limitations and sure enough, they are yours. - Richard Bach