I never wrote a word that I didn’t hear as I read.
~     Eudora Welty

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Familiarity. Memory of the way things get said. Once you have heard certain expressions, sentences, you almost never forget them. It’s like sending a bucket down the well and it always comes up full. You don’t know you’ve remembered, but you have. And you listen for the right word, in the present, and you hear it. Once you’re into a story everything seems to apply—what you overhear on a city bus is exactly what your character would say on the page you’re writing. Wherever you go, you meet part of your story. I guess you’re tuned in for it, and the right things are sort of magnetized—if you can think of your ears as magnets. I could hear someone saying—and I had to cut this out—”What, you never ate goat?” And someone answering, “Goat! Please don’t say you serve goat at this reunion. I wasn’t told it was goat I was served. I thought—” and so on, and then the recipe, and then it ended up with—I can’t remember exactly now—it ended with, “You can do a whole lot of things with vinegar.” Well, all these things I would just laugh about and think about for so long and put them in. And then I’d think, that’s just plain indulgence. Take it out! And I’d take it out.

~ Eudora Welty, quoted here