数学的本质不是使简单的事情复杂化，而是使复杂的事情简单化。

每当一座煤电厂关闭，美国的一部分心脏也随之关闭。

Prayer is not overcoming God's reluctance, but laying hold of His willingness.

You can't get mad at anybody else for your own mistakes.

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.

是非每天都会有，不去听自然也就消失了。