一切都可以从一个人身上夺走，除了一样：人类最后的自由——在任何特定环境下选择自己态度的能力。

"To understand the world, you must first seek to understand yourself."

A proof is a device for convincing someone else that a mathematical statement is true.

没有信任就无法度过一生：那将是被囚禁在最糟糕的牢房——自己之中。