A mind needs books as a sword needs a whetstone if it is to keep its edge.

释义：人如果没有喜事，精神就会萎靡不振；当运气不好、处境艰难时，往往会感到更加落寞和失落。

前代哲人高深玄妙的教诲，我不能背离。没有见到仁人之居，我将去哪里居住啊？没有见到义士足迹，我将怎么去追谁啊？

时节不寒冷，就不会知道松柏挺拔且郁郁葱葱的；事情不危难，就不会知道君子每日都在持守信念。

种一棵树最好的时间是20年前，其次是现在。

We don't receive wisdom; we must discover it for ourselves after a journey that no one can take for us or spare us.

I was not born blind, I became blind at the age of 12, but I never felt like a victim.

"The essence of mathematics is not to make simple things complicated, but to make complicated things simple."

通货膨胀是夜间的小偷。