君子有三种事应该加以警戒：年轻的时候，血气还没有固定，力戒贪恋女色；到了壮年时期，血气正旺盛，力戒逞强好斗；到了老年时期，血气已经衰弱，力戒贪得无厌。
The greatest rewards come from working on something that nobody else is working on.
The past is a shadow that never leaves.
I think that in mathematics, and maybe in life, you have to be willing to be a little bit lost.
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.
The study of life is the study of endless possibilities.