To one who has faith, no explanation is necessary. To one without faith, no explanation is possible.

南开校训，意为培养公正与能力兼备的人才，追求不断创新。

这是个有趣的星球，值得你倾注全部注意力。

真相不会让你自由，它只会让你看见锁链。

我相信伟大的教师就是伟大的艺术家，而且这样的艺术家和其他任何伟大的艺术家一样稀少。教学甚至可能是最伟大的艺术，因为它的媒介是人的思想和精神。

The most exciting, challenging and significant relationship of all is the one you have with yourself.

True progress comes from balancing economic growth with ecological responsibility.