We innovate by starting with the customer and working backwards. That becomes the touchstone for how we invent.

写作是唯一一件当我做它时，我不觉得我应该在做其他事情的事情。

The moment we want to believe something, we suddenly see all the arguments for it, and become blind to the arguments against it.

成功的秘诀是知道一些别人不知道的事。