The scariest moment is always just before you start.

移动的手指在书写；一旦写下，便继续前行：无论是你的虔诚还是智慧，都无法引诱它回来取消半行，你的泪水也无法洗去一个字。

这个人生阶段，这小小的阶段是“幸福来敲门”。

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.

生命的历史是适应的历史。

每一次观测都让我们更接近回答关于宇宙的基本问题。