The relevant equation is: Knowledge = power = energy = matter = mass; a good bookshop is just a genteel Black… — Terry Pratchett

Up in the gloom the heads of dead animals haunted the walls. The Ramkins seemed to have endangered more species than an ice age. (p. 349)

"Down there," he said, "are people who will follow any dragon, worship any god, ignore any iniquity. All out of a kind of humdrum, everyday badness. Not the really high, creative loathesomeness of the great sinners, but a sort of mass-produced darkness of the soul. Sin, you might say, without a trace of originality. They accept evil not because they say yes, but because they don't say no." (p. 337)

'No one knows how to do officering, Fred. That's why they're officers. If they'd knew anything, they'd be sergeants.'