The best and most beautiful things in the world cannot be seen or even touched - they must be felt with the heart.

The darkest nights produce the brightest stars.

一个有纸、笔、橡皮擦并且坚持严格的行为准则的人，实质上就是一台通用图灵机。

预测是非常困难的，尤其是关于未来。