The circumstances of the world are continually changing, and the opinions of man change also; and as government is for the living, and not for the dead, it is the living only that has any right in it.

It is in the thirties that we want friends. In the forties we know they won't save us any more than love did.

这是数着别人契上的齿数，而以为自己很富有。 

PID控制器是控制工程师的通用工具，适用于各种各样的过程。

我的国家是世界，我的宗教是行善。

"The human figure is the most profound subject an artist can explore."