做数学就是参与发现与猜想、直觉与灵感的过程。

真相是，我们都有能力做出极大的恶和极大的善。是我们做出的选择定义了我们。

Foreign policy should not be confused with missionary work.

Leadership is about making tough decisions with empathy and vision.

"A good illustration should tell a story on its own, without the need for words."