一个人需要相当的知识才能意识到自己的无知程度。
It takes considerable knowledge just to realize the extent of your own ignorance.
对于你所拥有的,要心存感激,这样你就会拥有更多。对于你所没有的,如果念念不忘,你永远都不会满足。
Happiness is not something ready-made. It comes from your own actions.