The Greatest Threat

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• Sherlock: I am without peer. Without sane peer, anyway, which is functionally identical to being without peer, full stop. I can only extend so much of myself to a non-peer, which means I can only extend so much of myself to anyone. I've made progress, of course, but I don't know how much more growth there is within me. If I can never value a relationship properly, then, at what point do I stop trying to maintain them?
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• Meeting leader: You haven't turned your back on the world yet.
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• Sherlock: But I am without peer. And that's the greatest threat to my sobriety.
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• Elementary 
• S02E21