从来没有人有过这样的朋友，如此深情，如此忠诚，如此娴熟。

Freedom of men under government is to have a standing rule to live by, common to everyone, and not to be subject to the inconstant, uncertain, arbitrary will of another man.

一本书应该像一场冒险，即使它只是关于在家的一天。

In mathematics, the art of proposing a question must be held of higher value than solving it.

自然的法则是无情的。