The greatest happiness is to know the source of unhappiness.

Your smarts will come in handy because you will travel in a land of marvels. We humans -- plodding as we are -- will astonish ourselves. We'll invent ways to generate clean energy and a lot of it. Atom by atom， we'll assemble tiny machines that will enter cell walls and make repairs. This month comes the extraordinary but also inevitable news that we've synthesized life. In the coming years， we'll not only synthesize it， but we'll engineer it to specifications. I believe you'll even see us understand the human brain. Jules Verne， Mark Twain， Galileo， Newton -- all the curious from the ages would have wanted to be alive most of all right now. As a civilization， we will have so many gifts， just as you as individuals have so many individual gifts as you sit before me.

Sustainability is not a destination, but a journey that requires continuous improvement and innovation.

La imaginación es el único país en el que soy libre.

赚钱的最好方法是买入一些东西，然后什么都不做。

有利的时机和气候不如有利的地势，有利的地势不如人的齐心协力。

The key to progress in science is persistence and an open mind.

安全不仅仅是一项政策，而是我们矿山每天必须践行的一种文化。