Theorems are the permanent literature of mathematics.

I'm not going to change who I am just because people want me to be something else.

Quality is not a department, it is a way of life.

在有地位的人面前不要诉说自己的卑贱，否则他会认为在要求他推荐。在富有的人面前不要说自己的贫困，否则他会认为在求他可怜。

最有力的艺术往往是最模糊的。