"happened as I listened: I felt pain. Not in my head, not in my arm, not in my leg; everywhere at once. I told myself there was no difference between being “inside” and being “outside,” that it all came down to X’s and O’s that could be acquired in any number of different ways, but the pain increased to a point where I thought I might collapse, and I limped away."

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Granny Weatherwax was often angry. She considered it one of her strong points. Genuine anger was one of the world's greatest creative forces. But you had to learn how to control it. That didn't mean you let it trickle away. it meant you dammed it, carefully, let it develop a working head, let it drown whole valleys of the mind and then, just when the whole structure was about to collapse, opened a tiny pipeline at the base and let the iron-hard stream of wrath power the turbines of revenge.

— Terry Pratchett