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你必须是自己幸福的最好判断者。
战争的目的不是要你为你的国家牺牲,而是要让你的敌人为他的国家牺牲。
"The essence of mathematics is not to make simple things complicated, but to make complicated things simple."
The work of art is a dialogue with the infinite.
"To understand madness, one must first speak its language."