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A mathematician is a person who can find analogies between theorems; a better mathematician is one who can see analogies between theories and the best mathematician can notice analogies between analogies.
数学家是能在定理间找到类比的人;更好的数学家能在理论间看到类比;而最优秀的数学家能注意到类比之间的类比。
The past is a shadow that follows us into the future.
一切迄今为止社会的历史都是阶级斗争的历史。
Leadership is about listening more than speaking.