一个好的数学家是能看到定理之间类比的人;一个伟大的数学家是能看到类比之间的类比的人。
Freedom is never voluntarily given by the oppressor; it must be demanded by the oppressed.
Fearless is not the absence of fear. It's not being completely unafraid. Fearless is having fears. Fearless is having doubts. Lots of them. Fearless is living in spite of those things, every day.