幸福的秘诀是：尽量扩大你的兴趣范围，对感兴趣的人和物尽可能友善。

We are all haunted by the ghosts of our own pasts, and sometimes, by the ghosts of others.

为别人浪费的一天并不是为自己浪费的一天。

数学研究是所有自然现象精确知识不可或缺的基础。

The periodic table hasn't changed, but how we use its elements must.

All mankind... being all equal and independent, no one ought to harm another in his life, health, liberty, or possessions.