"I'm so busy trying to breathe through the pain that I'm breathing through the pain of being with people, and that is no way to spend a life. Eventually, they'll just go away, because you will make them sad. That's something I've proven quite adept at doing over the years."

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Sherlock Holmes becomes more human and more adept at fitting in with a lot of people, but he remains separate from the human race because he finds that a better place to observe that from. He stays on the mountain top because there, he can see clearly.

— Steven Moffat