The dead are never far from us. They’re in our hearts and on our minds and in the end all that separates us from them is a single breath, one last puff of air.

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.

In mathematics, the journey is just as important as the destination, for it is through the process of discovery that we truly learn.

I was taught that the way of progress was neither swift nor easy.

做农业要有耐心，要耐得住寂寞。