User needs are both the starting point and the ultimate goal of product development.

成长来自于冒险，但必须是与你的愿景一致的计算过的冒险。

There is no history except as it is composed.

I have held many things in my hands, and I have lost them all; but whatever I have placed in God's hands, that I still possess.

追求数学知识是一场永无止境的冒险。

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.