"Most of what we get up to in the Laundry is symbolic computation intended to evoke decidedly nonsymbolic consequences. But that’s not all there is to...well, any sufficiently alien technology is indistinguishable from magic, so let’s call it that, all right? You can do magic by computation, but you can also do computation by magic. The law of similarity attracts unwelcome attention from other proximate universes, other domains where the laws of nature worked out differently. Meanwhile, the law of contagion spreads stuff around. Just as it’s possible to write a TCP/IP protocol stack in some utterly inappropriate programming language like ML or Visual Basic, so, too, it’s possible to implement TCP/IP over carrier pigeons, or paper tape, or daemons summoned from the vasty deep."

“The first rule of space travel...is that mistakes are fatal. Space isn’t friendly; it kills you. And there are no second chances.”

“Along the way she’d acquired a powerful conviction that history was a series of accidents—God was either absent or playing a very elaborate practical joke —and that the seeds of evil usually germinated in the footprints of people who knew how everybody else ought to behave and felt the need to tell them so.”

“Yup, that pretty much confirms the diagnosis. This is the desk of a diseased mind, hugely ambitious, prone to taking insanely dangerous risks. He’s not ashamed of boasting about it—he clearly believes in better alpha-primate dominance displays through carpentry.”

“One of the great besetting problems of the modern age is what to do with too much information.”

“It’s all he can do to refrain from prayer. God probably doesn’t want to know what he’s doing here this morning, a borderline accomplice to evil in service to a greater cause.”

“People didn’t always follow their best interests. Human beings were distressingly bad at risk analysis, lousy with hidden motivations and neuroses, anything but the clean rational actors that economists or diplomats wanted so desperately to believe in, and diplomats had to go by capabilities, not intentions.”