对人类同胞最大的罪恶不是憎恨，而是冷漠：那是不人道的本质。

景观的历史写在它的土壤、植被和地形中。

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.

Being different means you have something special to offer the world.

始终追求卓越，而不是完美。

Collaboration in mathematics is essential; the exchange of ideas leads to breakthroughs that no single mind could achieve alone.