The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.

The only merit I have is to have painted directly from nature.

【释义】诚信是自然万物的规律，追求诚信是做人的道德准则。

最伟大的发现往往在你没有刻意寻找时出现。

经济不平等不仅是一个道德问题，也是一个经济问题。