There is no such thing as a small life—only small perspectives.

Mining with integrity means leaving the land better than we found it.

让我告诉你我成功的秘诀。我的力量仅仅在于我的坚持不懈。

The real adventure is not outside, but within.

We think not in isolated ideas, but in continuous streams of purpose-directed activity.

When I stand before thee at the day's end thou shalt see my scars and know that I had my wounds and also my healing.

深入做某件事的唯一方法就是努力工作。

可持续性不是一种选择；它是我们对下一代的责任。

困难不在于提出新观念，而在于摆脱旧观念。

不把别人所不懂的告诉别人，把别人知道的东西告诉别人。