Time is money, don't waste it.
时间就是金钱，不要浪费它。
你越深入数学，就越意识到还有多少未知。
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。
"We all have our time machines. Some take us back, they're called memories. Some take us forward, they're called dreams."
In mathematics, the journey is often more important than the destination.