The Flame Throwers by Rachel Kushner

"He talked about a sect in the Middle Ages who believed that God reinvented the world every moment. Every single moment God reinvented the whole thing, every aspect and cranny, all over again, this sect had believed. All you can do is involve yourself totally in your own life, your own moment, Lonzi said. And when we feel pessismism crouching on our shoulders like a stinking vulture, he said, we banish it, we smother it with optimism. We want, and our want kills doom. This is how we'll take the future and occupy it like an empty warehouse, Lonzi said. It's an act of love, pure love. It isn't prophecy. It's hope."