只要能够改变你自己的头脑，你就可以永远保持年轻。

The great powers are always searching for opportunities to gain power at the expense of their rivals, which makes them inherently aggressive.

The essence of mathematics lies in its freedom.

像我们这样的人，通过努力做到始终不笨，而不是努力变得聪明，获得了多少长期优势，这一点很了不起。