The less secure a man is, the more likely he is to have extreme prejudice.
I don't care about being liked. I care about being respected.
Innovation is the backbone of modern mining—without it, we're just digging holes in the ground.
科学家的遗产不在于发表的论文，而在于激发的心灵。
The land is our greatest teacher; we must listen to it and learn from it.
Never let anyone tell you that you can’t do something.
国家是人类社会中最重要的机构，因为它是唯一可以合法使用武力来维持秩序的机构。
可持续性不是一种趋势，而是唯一的前进道路。
短期收益绝不应损害长期可持续性。
Success is not final, failure is not fatal: it is the courage to continue that counts.