理解一个句子意味着理解一种语言。
To understand a sentence means to understand a language.
Courage is the most important of all the virtues because without courage, you can't practice any other virtue consistently.
The more you know, the less you understand.
The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all.