——在广东和朋友谈自己的主张，1921年
Persistence in the face of failure is what separates successful scientists from the rest.
We must balance energy development with environmental protection to achieve sustainable growth.
【释义】富有但不骄傲，尊贵但不奢侈。
你越了解自己，就越不容易被事情困扰。
Not only do we live in the world of thought， but also in the world of matter.
But man is not made for defeat. A man can be destroyed but not defeated.