出自先秦《荀子·强国》。一个人知道爱惜生命、安于快乐而抛弃礼义，那就好比想长寿而自刎其颈一样。此以比喻来说明坚守礼仪对于“贵生乐安”的重要性，强调治国安邦不可缺失礼义的意义。

The meaning of life is contained in every single expression of life. It is present in the infinity of forms and phenomena that exist in all of creation.

最神奇的事情往往发生在我们视线的角落里。

A true mathematician is always a student, always learning.

没事要戒掉一个“偷”字，有事要戒掉一个“乱”字。