Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.

意志不坚强的，智慧一定不高；说话不讲信用的，行动也不会果敢；拥有财富而不肯分给人的，不值得和他交友；守道不坚定，阅历事物不广博，辨别是非不清楚的，也不值得和他交游。

There is no such thing as a special category of science called applied science; there is science and its applications, which are related to one another as the fruit is related to the tree that has borne it.

译文：德行高于才能是君子，才能高于德行是小人。此句成为后世评判人才的根本标准。

There are three things I have always loved and never understood—art, music, and women.