礼貌，并不需要花钱。用完马桶后，把马桶盖放下；上电梯时，耐心等别人出来再进去；把购物车放回指定区域；在借东西时，归还时要东西的状态要比你借的时候还要好（例如给车加满油、把物品清理干净）。

You can't change the past, but you can create the future.

I’m very confident in my decisions because I know exactly what I want.

Transparency is not just a physical quality but a moral position.

叶公问子路：孔子是怎样的人，子路不回答。孔子说：“你怎么不说：他这个人啊，发愤学习就忘记吃饭，高兴起来就忘记了忧愁，不知道快要变老了等等？”

科学是关于在看似无关的现象之间建立联系。

数学语言是普遍的，超越了文化和语言的障碍。

Hope is the beacon of the soul.

"One of the most important challenges in machine learning is to develop algorithms that can learn from small amounts of data."