Nothing Exists But You
You perceive, now, that these things are all impossible except in a dream. You perceive that they are pure and puerile insanities, the silly creations of an imagination that is not conscious of its freaks--in a word, that they are a dream, and you the maker of it. The dream-marks are all present; you should have recognized them earlier.
It is true, that which I have revealed to you; there is no God, no universe, no human have revealed to you; there is no God, no universe, no human race, no earthly life, no heaven, no hell. It is all a dream--a grotesque and foolish dream. Nothing exists but you. And you are but a thought--a vagrant thought, a useless thought, a homeless thought, wandering forlorn among the empty eternities!
He vanished, and left me appalled; for I knew, and realized, that all he had said was true.
Mark Twain, in 'The Mysterious Stranger'