"From this new point of view, the universe I had inhabited became an object I could perceive in its entirety. It was a hypersphere embedded in a cloud of alternative states—the sum of all possible quantum trajectories from the big bang to the decay of matter. “Reality”—history as we had known or inferred it—was only the most likely of these possible trajectories. There were countless others, real in a different sense: a vast but finite set of paths not taken, a ghostly forest of quantum alternatives, the shores of an unknown sea."

“The awful thing about lying was that it became a habit, then a reflex, as automatic as the blinking of the eyes or the voiding of the bowels. Lying was the Terrestrial disease, his mother used to say.”

“She gave me a disdainful look. “Please don’t make facile judgments about things you don’t understand.”

“I loved Molly. Or at least I told myself I did. Or, if what I felt for her was not love, it was at least a plausible imitation, a convincing substitute.”

“You have a knack for turning your eyes inside out, so you see them. And they see you. And you're afraid, because they’re from the uncreated future, from a place, I think, where the human race has reached its last incarnation, from the end of the material world. Perhaps the end of all worlds. And they’re sad—melancholy is the better word—because you're like an angel to them, the angel of the past, the angel of infinite possibility. Possibility lost. The road not taken.”

“Along with a dozen other students I had dissected a human cadaver and sorted its contents by size, color, function, and weight. There was nothing pleasant about the experience. Its only consolation was its truth and its only virtue was its utility.”

“You never stop being a parent, Adam, no matter how old or wise your child becomes—you'll see.”