The deepest problems in mathematics often arise from the simplest questions.

一个人独处要超脱，与别人共处要和蔼；没有事时享受闲适；有了事情要果断；得意时要显出淡泊，失意时要安然处之。

There is no necessary connection between law and morality.

"In the darkest times, hope is something you give yourself. That is the meaning of inner strength."

真正的发现之旅不在于寻找新的风景，而在于拥有新的眼光。

市场是一位伟大的老师，但它收取高昂的学费。