数学研究是所有智力和精神进步不可或缺的基础。

If there's a book that you want to read, but it hasn't been written yet, then you must write it.

No man is fit to hold office who isn't perfectly willing to leave it at any time...

强调抓住机遇的重要性

Nature is a volume of which God is the author.

最危险的故事是我们讲给自己的那些。

International politics is a ruthless and dangerous business, and it is foolish to expect states to behave according to moral principles.