Success is not final, failure is not fatal: It is the courage to continue that counts.

写作是探索可能和可想象界限的一种方式。

《致全国学农工商通电》（1924年4月12日）

"In the depth of winter, I finally learned that within me there lay an invincible summer."

Home is not where you live but where they understand you.

数学中最深刻的发现往往来自最简单的观察。