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数学的本质在于它的自由。
The essence of mathematics lies in its freedom.
"A story is a letter that the author writes to himself, to tell himself things that he would be unable to discover otherwise."
"To me, fearless is not the absence of fear. It's not being completely unafraid. To me, fearless is having fears. Fearless is having doubts. Lots of them. To me, fearless is living in spite of those things that scare you to death."
数学家是能在定理之间找到类比的人;更好的数学家是能在证明之间看到类比的人;而最好的数学家是能注意到理论之间类比的人。
一年中的夜晚与白天数量相同、持续时间一样长。即使快乐的生活也有其阴暗笔触,没有“悲哀”提供平衡,“愉快”一词就会失去意义。耐心镇静地接受世事变迁,是最好的处事之道。