一个人能做的最好的事情就是帮助另一个人知道更多。

数学中发现的快乐是无与伦比的。

The seabbard is content to be dull when it protects the keenness of the word.

Man is so much the voice of his interest that it is not enough to make him see the right， but you must make him feel it.

I had ambition not only to go farther than any man had been before, but as far as it was possible for a man to go.