The best time to plant a tree was 20 years ago. The second best time is now.
To say 'I love you' one must first know how to say the 'I'.
面对失败时的坚持将成功的科学家与其他人区分开来。
The only thing I know is that I don't know anything.
我们知道世界将不再相同。少数人笑了，少数人哭了，大多数人沉默不语。
每个故事都是一种幽灵，萦绕在当下。
To be aware of the idea of social structure and to use it with sensibility is to be capable of tracing such linkages among a great variety of milieux.
It really matters whether people are working on generating clean energy or improving transportation or making the Internet work better and all those things. And small groups of people can have a really huge impact.