计算复杂性理论的发展向我们展示了并非所有问题都是平等的。
The books that we reread the most are the ones that most clearly describe the world we already know.
我们重读最多的书是那些最清楚地描述我们已经知道的世界的书。
What matters in life is not what happens to you but what you remember and how you remember it.
登山不因为艰难险峻就停止攀登,那么最终必定能登上峻岭。