Never forget what you are, for surely the world will not. Make it your strength. Then it can never be your weakness. Armor yourself in it, and it will never be used to hurt you. 

在计算学习理论中，我们试图理解从数据中学习的基本原理。

"The only thing we know about the future is that it will be different."

Reality is a question of perspective; the further you get from the past, the more concrete and plausible it seems—but as you approach the present, it inevitably seems more and more incredible.