It's Hard To Believe That Something Which Is Neither Seen Nor Felt Can Do So Much Harm.

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It's hard to believe that something which is neither seen nor
felt can do so much harm.
That's true. But an idea can't be seen or felt. And that's
what kept the Troglytes in the mines all these centuries. A
mistaken idea.
-- Vanna and Kirk, "The Cloud Minders," stardate 5819.0

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