The moment you doubt whether you can fly, you cease forever to be able to do it.

I think that the most important thing a woman can have - next to talent, of course - is her hairdresser.

Every mathematical problem has a solution; it just takes time and effort to find it.

历史中的优点似乎有三种，一种是来自气候和国家的纯粹地理位置，一种是来自政府形式和人民性格，一种是来自那些更细致的哲学原则和道德，可以称为哲学的推荐。