There is none who cannot teach somebody something, and there is none so excellent but he is excelled.

There is none who cannot teach somebody something, and there is none so excellent but he is excelled.

没有一个人不能教给别人一些东西，也没有一个人如此优秀，但他是卓越的。

-- Baltasar Gracián 巴尔塔萨尔·格雷西