技术可以彻底改变矿业，但前提是我们有勇气接受它。
The greatest happiness is to know the source of unhappiness.
To read is to travel without moving; to write is to move without traveling.
Quality fruit starts with quality soil - we must care for the foundation of all growth.
译文：发出叱咤风云的气势，精神四处飞扬。
At an early age I learned that people make mistakes, and you have to decide if their mistakes are bigger than your love for them.
And I hope you will come back here to Harvard 30 years from now and reflect on what you have done with your talent and your energy. I hope you will judge yourselves not on your professional accomplishments alone, but also on how well you have addressed the world's deepest inequities…on how well you treated people a world away who have nothing in common with you but their humanity.