He was going mad and knew it, and
somewhere deep inside a bit of sanity was screaming, struggling to fight off
the hopeless flood of black terror. It was very horrible to go mad and know
that you were going mad -- to know that in a little minute you would be here
physically and yet all the real essence would be dead and drowned in the
black madness. For this was the Dark -- the Dark and the Cold and the Doom.

Autor: Isaac Asimov