如果经济学家能够使自己被认为是谦逊的，能干的，与牙医水平相当的人，这是好的。
If economists could manage to get themselves thought of as humble， competent people on a level with dentists， that would be splendid.
There are wounds that never heal, only scab over.
Theorems are the permanent literature of mathematics.
The most important property of a program is whether it accomplishes the intention of its user.
The measure of a good book is determined by how much it disturbs and troubles its reader.
随着我们深入量子世界，我们发现拓扑不仅仅是数学上的好奇，而是自然界的一个基本方面。