成功的关键是专注于目标，而不是障碍。

Tyranny is rooted in fear.

Every tyrant who has lived has believed in freedom--for himself.

Letters are the biographer's gold mine; they reveal what official records conceal.

"Prime numbers are what is left when you have taken all the patterns away. I think prime numbers are like life. They are very logical but you could never work out the rules, even if you spent all your time thinking about them."

几何不仅仅是关于形状；它是关于理解我们生活的空间及其内部的关系。