" And it all flew away like a dream--even my passion, and yet it really was strong and true, but...where has it gone now? Indeed the thought occasionally flits through my head: "Didn't I go out of my mind then and spend the whole time sitting in a madhouse somewhere, and maybe I'm sitting there now--so that for me it was all a seeming and only seems to this day. "

― Fyodor Dostoevsky , The Gambler