For the past 33 years， I have looked in the mirror every morning and asked myself: 'If today were the last day of my life， would I want to do what I am about to do today？' And whenever the answer has been 'No' for too many days in a row， I know I need to change something.

文学是所有艺术中最具颠覆性的，因为它在读者的头脑中秘密运作。

人生的时间是有限并不可变的，所以要有效率地用每一分钟，不用好就是一种浪费。

数学不是观赏性运动——你必须参与其中才能欣赏它的美。