“A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.”

“You're a jerk,' repeated the alien, 'a complete asshole.”

“Anything that thinks logically can be fooled by something else that thinks at least as logically as it does.”

“Zaphod Beeblebrox, adventurer, ex-hippie, good-timer (crook? quite possibly), manic self-publicist, terribly bad at personal relationships, often thought to be completely out to lunch.”

“To Trin Tragula's horror, the shock completely annihilated her brain; but to his satisfaction he realized that he had proved conclusively that if life is going to exist in a Universe of this size, then the one thing it cannot afford to have is a sense of proportion.”

“Mark Carwardine's role, essentially, was to be the one who knew what he was talking about. My role, and one for which I was entirely qualified, was to be an extremely ignorant non-zoologist to whom everything that happened would come as a complete surprise.”

“I remembered once, in Japan, having been to see the Gold Pavilion Temple in Kyoto and being mildly surprised at quite how well it had weathered the passage of time since it was first built in the fourteenth century. I was told it hadn’t weathered well at all, and had in fact been burnt to the ground twice in this century. “So it isn’t the original building?” I had asked my Japanese guide.“But yes, of course it is,” he insisted, rather surprised at my question.“But it’s burnt down?”“Yes.”“Twice.”“Many times.”“And rebuilt.”“Of course. It is an important and historic building.”“With completely new materials.”“But of course. It was burnt down.”“So how can it be the same building?”“It is always the same building.”I had to admit to myself that this was in fact a perfectly rational point of view, it merely started from an unexpected premise. The idea of the building, the intention of it, its design, are all immutable and are the essence of the building. The intention of the original builders is what survives. The wood of which the design is constructed decays and is replaced when necessary. To be overly concerned with the original materials, which are merely sentimental souvenirs of the past, is to fail to see the living building itself.”