This is the 11th in a series of posts where I provide a quote from one of Jack Kerouac's books and you figure out which one. Post your answer as a comment. Here's the passage:
. . . so I took a piece of paper about as big as a thumbnail and carefully printed on it: MAY YOU USE THE DIAMONDCUTTER OF MERCY and when I said goodbye to him at the pier I handed it to him, and he read it, put it right in his pocket, and said nothing.
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