数学的研究是所有智力和精神进步不可或缺的基础。

真相很少是纯粹的，也从来不简单。

The key is to set realistic customer expectations, and then not to just meet them, but to exceed them — preferably in unexpected and helpful ways.

艺术源于必要性，而非时尚。

哪里有自由，哪里就是我的祖国。