It seemed clear to me that life and the world somehow depended upon me now. I may almost say that the world now seemed created for me alone: if I shot myself the world would cease to be at least for me. I say nothing of its being likely that nothing will exist for anyone when I am gone, and that as soon as my consciousness is extinguished the whole world will vanish too and become void like a phantom, as a mere appurtenance of my consciousness, for possibly all this world and all these people are only me myself.

II - The Dream of a Ridiculous Man (1877)