我们学得越多，就越意识到我们不知道的还有很多。

But it is the same with man as with the tree. The more he seeks to rise into the height and light, the more vigorously do his roots struggle earthword, downword, into the dark, the deep - into evil.

Spend each day trying to be a little wiser than you were when you woke up.

Success is a journey, not a destination. It's about the progress you make along the way.