Pain is G-d's megaphone to wake up the world.
The natural life in each of us is something self-centred, something that wants to be petted and admired, to take advantage of other lives, to exploit the whole universe.
If we accept Heaven we shall not be able to retain even the smallest and most intimate souvenirs of Hell.
How incessant and great are the ills with which a prolonged old age is replete.
You die and die and then you are beyond death.
In great literature, I become a thousand different men but still remain myself.