“... But the actual touch of her lingered, inside his heart. That remained. In all the years of his life ahead, the long years without her, with never seeing her or hearing from her or knowing anything about her, if she was alive or happy or dead or what, that touch stayed locked within him, sealed in himself, and never went away. That one touch of her hand.”

A Scanner Darkly, Philip K. Dick

“Reality is that which, when you stop believing in it, doesn't go away.”

Do Androids Dream of Electric Sheep?, Philip K. Dick