"The Dark Tower" series.

I understand it may become a movie soon....

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Sometimes referred to as the greatest of all American novels, this book contains these quotes:

"I wanted you to see what real courage is, instead of getting the idea that courage is a man with a gun in his hand. It's when you know you're licked before you begin but you begin anyway and you see it through no matter what. You rarely win, but sometimes you do."

"She seemed glad to see me when I appeared in the kitchen, and by watching her I began to think there was some skill involved in being a girl."

"So it took an eight-year-old child to bring 'em to their senses.... That proves something - that a gang of wild animals can be stopped, simply because they're still human. Hmp, maybe we need a police force of children."

What novel is it?