一个有趣的事实是，岩石越古老，与今天的岩石差异越大。

Profitability and purpose are not mutually exclusive—they are increasingly interdependent.

It is not shame for a man to learn that which he knows not，whatever his age.

Singing is 90% listening. You have to listen to the silence too.

Every book is a journey, and every journey is a book.