That's what your memory/the book's index is for.

Now, of course, quite a lot of the books I read don't have indices. Because, you know, they're fiction. But I'm pretty good about remembering where, approximately, in the book the bit I'm looking for is.

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Gillian

"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"

"You can't erase icing."

"I can't believe it doesn't work! I found it on the internet, man!"