过去是一张地图，显示我们曾去过哪里。
The past is a map, showing us where we have been.
The books that the world calls immoral are books that show the world its own shame.
"The dead are never far from us. They're in our hearts and in our minds and in the end, they're all we've got."
生活不是关于你不能做什么，而是关于你能做什么。
我们必须带着同理心和目的来设计技术。
做数学就是同时参与创造和发现的行为。