Sometimes you put walls up not to keep people out,but to see who cares enough to break them down.
有时你建起心墙并非为了远离人群,而是为了看清谁在乎去推倒它。
The only way to learn mathematics is to do mathematics.
科学的本质是提出正确的问题。
不义的人不能让他富裕,不义的人不能让他显贵,不义的人不能给他信任,不义的人不使他接近。 
The scientist is not a person who gives the right answers, he's one who asks the right questions.