数学是给不同事物以相同名称的艺术。
Mathematics is the art of giving the same name to different things.
Reality is a construction of the mind.
【释义】做官要关心百姓,居家要照顾家人,做事要顾及自身。
When I look at the world I'm pessimistic, but when I look at people I am optimistic.
译文:答应别人的话,千两黄金都不能更改。