I think that the thing that makes mathematics worthwhile is the fact that it has this incredible structure that you can explore and discover.

指事物之间相互依存、相互制约的关系。

"The act of writing is an act of courage, a confrontation with the self and the world."

Even in the quietest lives, there is drama.

出自汉·桓宽《盐铁论·刺义》。品德高尚的人不拒绝听取负薪之人的意见，其名声才能远播。所以见多识广的人知识广博，多听多闻的人拥有智慧，拒绝别人劝说的人心胸狭隘，一味相信自己的人必然孤立。