悲观导致软弱，乐观带来力量。
"In computer science, we are always trying to find the balance between expressiveness and tractability."
The history of the world is the history of the few.
The general population doesn't know what's happening, and it doesn't even know that it doesn't know.
普通大众不知道正在发生什么，甚至不知道他们不知道。
最好的设计是那些能解决问题而不会带来新问题的设计。