We're not in the junk business. We're not in the business of making a lot of products. We're in the business of making great products.

Safety isn't just a policy, it's a culture that must be lived every day in our mines.

Prediction is very difficult, especially about the future.

数学的研究就像空气或重力——它无处不在，你看不到它，但你知道它在那里。

如果你不愿意努力工作，就别指望成功。

我们遇到了一个悖论，这真是太棒了。现在我们有了进步的希望。

I was born in Africa.I came to California because it’s really where new technologies can be brought to fruition， and I don’t see a viable competitor.