在糟糕的时候抱有希望不仅仅是愚蠢的浪漫。这是基于人类历史不仅是残酷的历史，也是同情、牺牲、勇气和善良的历史。
"To be hopeful in bad times is not just foolishly romantic. It is based on the fact that human history is a history not only of cruelty, but also of compassion, sacrifice, courage, kindness."
If you want to be successful, you have to be willing to fail.
最大的性能改进是当系统从不能工作到能工作的时候。
For every expert there is an equal and opposite expert, but for every fact there is not necessarily an equal and opposite fact.