世界总是危险的，人们总是有好有坏。
A person who is too nice an observer of the business of the crowd, like one who is too curious in observing the labor of bees, will often be stung for his curiosity.
不论你怎么看待历史，历史都会在你身上留下痕迹。
You never lose a dream; it just incubates as a hobby.
The only way to learn mathematics is to do mathematics.