"Just living is not enough... one must have sunshine, freedom, and a little flower."

No one is altogether to be blamed for the defects of his nature; but he is blameworthy if he takes no pains to correct them.  

Every piece of plastic we produce should have a clear path to reuse or recycling.

数学不知道种族或地理边界；对于数学来说，文化世界是一个国家。

孤独是人类的常态。培养它。它在你内心开辟的隧道让你的灵魂有成长的空间。

学习贵在专一，不以涉猎广泛为能。