When you get an invitation to do something in the future， ask yourself: would you accept this if it was scheduled for tomorrow？ Not too many promises will pass that immediacy filter.

Boldness is the beginning of action， but fortune controls how it ends.

To write history is to wrestle with ghosts.

"Books are the windows to other cultures."

我们写的每一个方程都是宇宙的一首诗，是存在伟大史诗中的一节。