"In Francis’s view there was ultimate gold in this commitment to impractical knowledge, to theories that had no responsibilities other than to be true. On good days the new ideas inched human intellect toward the grand understandings that were science’s pride and joy."

“Let’s just hope that gravity isn’t as heavy as it used to be...”

“He was a devout believer in the second chance. To the man who asked, “What’s the point of closing the barn door after the horse has been stolen?” Murray would answer, “The point is that the door is now closed.”

“Be sure to convict that chucklehead. He thinks a country’s Christianity is measured by the size of its thermonuclear arsenal.”

“Imagine that a team of neuroscientists has just unveiled a technology that lets a person remove all trace of some terrible experience from his brain. Under what conditions, if any, would you use it? What might it be like to go through life knowing you’d once suffered an ordeal so dreadful that it demanded radical excision? How long could you endure this strange affirmative ignorance, this lost access to the unspeakable, without becoming neurotic, or even slightly mad? In the long run, might you not decide that such circumscribed amnesia was worse than whatever memory you’d felt compelled to erase?”

“Much as I hate to admit it, humanity will get along perfectly well without me. Any species that could invent the twentieth century entirely on its own doesn’t need a Prince of Darkness.”

“Often Burne found himself saying, “I don’t think you would make a very good soldier,” and with grating predictability he heard that he wouldn’t make a very good pacifist.”