"It takes a very strong head to keep secrets for years and not go slightly mad. It isn't wise to be advised by anyone slightly mad."

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The way the United States intelligence community operates is it doesn't limit itself to the protection of the homeland. It doesn't limit itself to countering terrorist threats, countering nuclear proliferation. It's also used for economic espionage, for political spying to gain some knowledge of what other countries are doing.

— Edward Snowden