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The Doctor: The human superpower, forgetting. If you could remember how things felt, you'd have stopped having wars. And stopped having babies.

Doctor Who. e10 s8

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The Doctor: I'm not running away. But this is one corner of one country on one continent on one planet that's a corner of a galaxy that's a corner of a universe that is forever growing and shrinking and creating and growing and never remaining the same for a single millisecond, and there is so much—so much to see, Amy. Because it goes so fast. I'm not running away from things, I am running to them. Before they flare and fade forever.

Doctor Who. "The Power of Three"

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Rory: The Doctor said the Universe was huge and ridiculous and sometimes there were miracles. I could do with a ridiculous miracle about now.

Doctor Who. The Big Bang 2 (S05,E13)

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The Doctor: This is a night for lost things being found.

Doctor Who

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Elton Pope: We forget because we must.

Doctor Who. Love & Monsters (2006)

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The Doctor: I could save the world but lose you.

Doctor Who. World War Three (S1 E5 2005)