You don’t need a weatherman to know which way the wind blows.

The right of nature... is the liberty each man hath, to use his own power, as he will himself, for the preservation of his own nature; that is to say, of his own life.

真正的幸福存在于心中。

科学中最重要的不是获得新的事实，而是发现思考它们的新方法。

凡是教师缺乏爱的地方，无论品格还是智慧都不能充分地或自由地发展。