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世界は広くて、狹い。

Existence is not its own justification.

One ought never to turn one's back on a threatened danger and try to run away from it. If you do that, you will double the danger. But if you meet it promptly and without flinching, you will reduce the danger by half.

Innovation distinguishes between a leader and a follower.

Forgetting is more powerful than despair.

國家本質上是侵略性和擴張主義的，因為它們存在于一個無政府狀態的國際體系中，沒有更高的權威來約束它們。