人们总是倾向于高估一天能达成的事情，而低估十年能取得的成就。奇迹常常可以在十年的尺度上发生。长期主义能够实现的小进展的持续积累的复利，足以超越哪怕巨大的失误。
We tend to overestimate what we can do in a day， and underestimate what we can achieve in a decade. Miraculous things can be accomplished if you give it ten years. A long game will compound small gains to overcome even big 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.