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Theorems are eternal; their proofs are ephemeral.
定理是永恒的;它们的证明是短暂的。
I am always glad to think that my education was, for the most part, informal, and had its roots in the soil.
想要行善的人在门外敲著门;爱人的,看见门是敞开的。
我们从失败中学到的东西要比在成功中学到的东西要多得多。