The best thing to hold onto in life is each other.
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.
Writing is a way of bearing witness.
数学中最深刻的思想往往源于最简单的观察。
悲伤是一座房子，那里的椅子已忘了如何支撑我们，镜子忘了如何映照我们，墙壁忘了如何包容我们。
The future of energy lies in diversification—no single source will meet all our needs.