可持续性不是一种选择；它是我们对下一代的责任。

沉默越深，内心的声音就越响亮。

The historian must have some kinship with his subject. The dead will not speak unless they are properly addressed.

当没有人相信你时，你必须相信自己。

睡眠不是奢侈品，而是大脑的必需品。

南开校训，意为培养公正与能力兼备的人才，追求不断创新。