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"Go ahead, sir," I said. He continued, "Picture in your mind a broad, immense sea spreading over a vast area,
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but with an entrance no wider than a river.
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No one who wishes to enter that sea, whether to visit it or control it, can reach its broad expanse of water without passing through the narrow entrance.
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Or take another example: Picture a city built on a plain. The city is full of all kinds of good things,
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but the entrance to it is narrow and steep, with fire on one side and deep water on the other.