农业的成功源于对土地和耕种者的理解。

记忆是一种成就，甚至是一种更新。

Nature is the best teacher.

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.

自由就是选择的重担。